Competition Law and Antitrust Implications of Ecosystem Exclusion Mechanisms

1. Introduction

Modern digital markets increasingly operate through ecosystems rather than isolated products. An ecosystem may consist of an operating system, app store, payment system, cloud service, search engine, advertising platform, hardware, data infrastructure, APIs, and complementary services controlled or coordinated by the same undertaking.

Ecosystem exclusion mechanisms arise when a powerful undertaking uses control over one component of an ecosystem to restrict, disadvantage, foreclose, or weaken competitors in another component. The conduct may not always resemble a traditional monopoly. Instead, exclusion can occur through:

• tying and bundling;
• self-preferencing;
• default settings;
• restrictions on interoperability;
• denial or degradation of access to APIs;
• exclusive dealing;
• app-store restrictions;
• discriminatory access to data;
• anti-steering restrictions;
• technical restrictions or interoperability degradation;
• platform parity obligations;
• leveraging data or network effects across markets; and
• acquisition or control of complementary infrastructure.

The central competition-law question is whether the ecosystem owner is competing on the merits or using ecosystem control to unlawfully protect or extend market power.

2. Meaning of an Ecosystem Exclusion Mechanism

An ecosystem exclusion mechanism can be understood as a strategy through which an undertaking uses control over one or more interconnected products, services, technologies, users, data resources, or distribution channels to disadvantage rival products or services.

A simplified structure is:

Control of Core Layer → Dependence of Users/Business Partners → Restriction of Rival Access → Foreclosure → Reinforcement of Ecosystem Power

For example:

Operating System → App Store → Payment System → Developers

If the operating-system owner requires developers to use its payment system and simultaneously prevents alternative payment systems from competing, the conduct may create exclusionary effects in payment services.

3. Why Ecosystem Exclusion Is Different from Traditional Exclusion

Traditional antitrust analysis often examines a single relevant market. Digital ecosystems create a more complicated structure.

A. Multiple interconnected markets

An ecosystem can contain:

1. a primary market;
2. complementary markets;
3. distribution markets;
4. data markets;
5. advertising markets;
6. infrastructure markets; and
7. aftermarkets.

Conduct in one market can therefore affect competition elsewhere.

B. Network effects

The value of a digital platform can increase as more users, developers, advertisers or sellers join it.

This creates a feedback loop:

More users → more developers → more applications → greater consumer value → more users.

Exclusion of rivals at an early stage may therefore have effects extending beyond immediate price competition.

C. Switching costs

Users may accumulate:

• data;
• subscriptions;
• applications;
• contacts;
• purchase histories;
• loyalty benefits;
• digital assets; and
• device-specific investments.

These costs can make switching difficult even where competing products are technically available.

D. Data advantages

An ecosystem operator may obtain data from one service and use it to strengthen another service.

This can create an important competitive advantage without an obvious price increase.

4. Major Competition-Law Theories Applicable to Ecosystem Exclusion

4.1 Abuse of Dominant Position

Where an undertaking possesses substantial market power, exclusionary conduct can constitute abuse of dominance.

The analysis generally asks:

1. What is the relevant market?
2. Does the undertaking possess dominance or substantial market power?
3. What conduct has been adopted?
4. Does it exclude or weaken rivals?
5. Is there a legitimate objective?
6. Are there less restrictive means?
7. What are the effects on consumers and competition?

5. Tying and Bundling

Tying occurs where the purchase or use of one product is conditioned upon use of another product.

In ecosystem markets, tying can be especially powerful because the undertaking may control the technical architecture necessary to distribute the tied product.

Example

An operating-system provider may make access to its operating system conditional upon use of:

• its browser;
• search engine;
• payment service;
• cloud service; or
• advertising technology.

The competitive concern is that the undertaking may transfer market power from the tying market into the tied market.

6. Self-Preferencing

Self-preferencing occurs when an ecosystem operator gives preferential treatment to its own downstream service.

Possible mechanisms include:

• superior ranking;
• preferred search placement;
• better access to data;
• preferential algorithmic treatment;
• lower platform fees;
• preferential technical integration; or
• privileged access to users.

The competition concern is particularly significant where the platform simultaneously acts as:

Infrastructure provider + marketplace operator + downstream competitor.

7. Interoperability Restrictions

Interoperability can be critical to competition in ecosystems.

An undertaking may attempt to exclude rivals by:

• withholding technical information;
• limiting APIs;
• restricting compatibility;
• degrading interoperability;
• changing technical standards;
• imposing discriminatory access conditions; or
• preventing alternative services from communicating with the ecosystem.

This can transform technical architecture into a competitive weapon.

8. Denial of Access and Essential-Facility Issues

Where competitors depend upon an infrastructure controlled by a dominant undertaking, refusal to provide access may raise essential-facility or refusal-to-deal concerns.

However, competition law generally does not require every dominant undertaking to deal with competitors.

The difficult issue is determining when refusal to supply becomes sufficiently harmful to competition to justify intervention.

9. Exclusive Dealing and Ecosystem Lock-In

Exclusivity can become particularly powerful when combined with network effects.

For example:

Platform exclusivity + user network + developer dependence + data advantage

may make it difficult for a rival ecosystem to achieve sufficient scale.

The relevant question is therefore not merely whether an agreement is exclusive, but whether the cumulative effect is to foreclose an important portion of competition.

10. Default Arrangements

Defaults can have substantial competitive significance.

Consumers frequently retain pre-installed or default services rather than actively selecting alternatives.

Consequently:

Default position → increased usage → more data → improved service → stronger ecosystem → stronger default advantage.

The competition concern is that a dominant ecosystem may use defaults to entrench its position even when rivals offer viable alternatives.

11. Data-Based Exclusion

Ecosystem operators may possess large quantities of:

• consumer data;
• transaction data;
• search data;
• advertising data;
• seller data;
• app usage information; and
• behavioural data.

Competition concerns arise where the undertaking:

1. prevents competitors from accessing necessary data;
2. combines data across markets;
3. uses non-public business-user data against those businesses;
4. gives its own service preferential data access; or
5. makes portability difficult.

Data therefore may operate as an ecosystem entry barrier.

12. Important Case Laws

1. Microsoft Corp. v. Commission — European Union

Case: Microsoft Corp. v Commission, Case T-201/04, General Court, 2007.

Facts

The European Commission found that Microsoft had abused its dominant position in the PC operating-system market, including by refusing to provide interoperability information necessary for competing work-group server products and by tying Windows Media Player to Windows.

Legal significance

The case demonstrates two important ecosystem exclusion theories:

• interoperability foreclosure, and
• technological tying.

Microsoft's control over the operating system gave it substantial influence over complementary software markets.

Principle

A dominant technology provider cannot necessarily use control over a foundational platform to deprive complementary products of effective competitive opportunities.

Ecosystem relevance

The case is an early illustration of the modern ecosystem problem:

Control over a core technological layer can provide leverage into complementary markets.

13. Google Android

Case: Google Android, European Commission Decision AT.40099, 2018.

Facts

The European Commission examined Google's conduct concerning the Android mobile operating-system ecosystem.

The Commission addressed arrangements involving:

• Google Search;
• Chrome;
• Google Play Store;
• Android devices;
• licensing arrangements; and
• restrictions affecting competing search services.

Competition concerns

The case involved several mechanisms through which Google's position in the Android ecosystem could reinforce its position in related markets.

The Commission particularly examined:

1. tying of Google Search and Play Store;
2. tying of Google Search and Chrome;
3. anti-fragmentation arrangements; and
4. payments associated with search exclusivity.

Legal significance

The case illustrates how an ecosystem can be used to reinforce dominance across interconnected digital markets.

Ecosystem principle

The important lesson is that competition analysis may need to examine the combined architecture of an ecosystem rather than isolated contractual clauses.

14. Google Shopping

Case: Google Search (Shopping), European Commission Decision AT.39740, 2017; Google and Alphabet v Commission, Case C-48/22 P, Court of Justice, 2024.

Facts

Google operated a dominant general search engine while also operating its own comparison-shopping service.

The Commission found that Google systematically gave prominent placement to its comparison-shopping service while demoting competing comparison-shopping services.

Competition concern

The case is a leading example of self-preferencing.

Google controlled an important gateway—general search—and simultaneously competed downstream.

Legal significance

The case demonstrates that a platform's control over an important distribution channel may become problematic when the platform uses that control to disadvantage competing downstream services.

Ecosystem principle

The central ecosystem issue is:

Can an infrastructure operator use its gateway position to favour its own downstream business?

The case is particularly important for search engines, marketplaces, app stores and other vertically integrated ecosystems.

15. Amazon Marketplace Investigation

Case: European Commission, Amazon Marketplace investigation, AT.40462 and AT.40703.

Facts

The European Commission investigated Amazon's use of non-public seller data obtained through its marketplace.

Amazon simultaneously operated:

• a marketplace hosting independent sellers; and
• its own retail business competing with those sellers.

Competition concern

The concern was that Amazon could potentially use information generated by independent sellers to strengthen its own retail operations.

Ecosystem significance

This presents a distinctive form of ecosystem exclusion:

Platform infrastructure → collection of competitor information → downstream competitive advantage.

Principle

Where a platform competes with businesses that depend upon its infrastructure, access to non-public commercial information can create a significant conflict between the platform's gatekeeper role and its competitive role.

16. Slovak Telekom v Commission

Case: Slovak Telekom a.s. and Deutsche Telekom AG v Commission, Joined Cases C-152/19 P and C-165/19 P, Court of Justice, 2021.

Facts

The case concerned access to telecommunications infrastructure and alleged exclusionary conduct involving access arrangements.

Legal significance

The Court considered the relationship between:

• abuse of dominance;
• refusal of access;
• infrastructure control; and
• margin-squeeze analysis.

Ecosystem relevance

Telecommunications networks illustrate an important form of ecosystem:

Physical network → wholesale access → downstream services → consumers.

Where a dominant undertaking controls an upstream infrastructure layer and competes downstream, its control over access conditions can affect downstream competition.

Principle

Infrastructure control can become a source of downstream competitive leverage when access terms place competitors at a competitive disadvantage.

17. Bronner v Mediaprint

Case: Oscar Bronner GmbH & Co. KG v Mediaprint, Case C-7/97, Court of Justice, 1998.

Facts

Bronner sought access to Mediaprint's newspaper home-delivery system.

The issue was whether the dominant undertaking's distribution infrastructure had to be made available to a competitor.

Legal significance

The Court established a demanding framework for refusal-to-deal/essential-facility claims.

Among the important considerations were whether:

• the facility was indispensable;
• duplication was practically or economically impossible; and
• refusal would eliminate effective competition.

Ecosystem relevance

The case remains important because digital ecosystems frequently involve infrastructure that competitors would like to access.

It establishes an important counterbalance:

Dominance does not automatically create a general obligation to share infrastructure.

18. IMS Health

Case: IMS Health GmbH & Co. OHG v NDC Health GmbH & Co. KG, Joined Cases C-418/01 P, Court of Justice, 2004.

Facts

IMS Health possessed copyright-related rights over a pharmaceutical data structure used for regional pharmaceutical sales information.

A competitor sought access to the structure.

Legal significance

The Court addressed when refusal to license intellectual property could constitute abuse of dominance.

The case developed strict conditions concerning circumstances in which refusal to license can become exclusionary.

Ecosystem relevance

Modern ecosystems often depend upon:

• APIs;
• technical standards;
• databases;
• proprietary interfaces;
• interoperability specifications; and
• intellectual property.

IMS Health therefore provides an important framework for distinguishing legitimate proprietary control from exclusionary conduct.

19. Qualcomm

Case: Qualcomm (Commission Decision AT.39711, 2018; General Court judgment in 2022).

Facts

The European Commission examined Qualcomm's payments to Apple in connection with baseband chipsets.

Competition concern

The Commission treated the arrangements as capable of excluding competing chipset suppliers from an important customer.

Ecosystem significance

The case illustrates how exclusivity-related financial arrangements can operate within technology ecosystems.

A dominant or powerful supplier may attempt to secure an important downstream customer whose product is itself a gateway to consumers.

Principle

Exclusionary effects may arise from financial arrangements even where the mechanism does not involve a conventional technical restriction.

20. Intel

Case: Intel Corp. v European Commission, Case C-413/14 P, Court of Justice, 2017; subsequent General Court proceedings.

Facts

Intel was found to have used rebates involving major computer manufacturers and a retailer.

Competition concern

The issue concerned whether loyalty-inducing rebates could exclude competing suppliers.

Legal significance

The Court emphasized the importance of examining whether rebates are capable of producing anticompetitive foreclosure, including through an effects-based assessment where relevant.

Ecosystem relevance

The principle extends beyond CPUs.

In ecosystem markets, financial incentives can be used to create:

• developer exclusivity;
• distributor exclusivity;
• hardware exclusivity;
• platform exclusivity; or
• preferential distribution arrangements.

21. Epic Games v Apple

Case: Epic Games, Inc. v Apple Inc., U.S. District Court for the Northern District of California, 2021.

Facts

Epic challenged Apple's App Store rules, particularly Apple's restrictions concerning alternative payment mechanisms and external steering.

Competition concerns

The dispute examined:

• app distribution;
• payment systems;
• commission structures;
• anti-steering rules;
• alternative payment systems; and
• Apple's control over iOS distribution.

Legal significance

The case illustrates the competitive importance of app-store architecture.

Apple controlled the operating system and app distribution infrastructure while also operating payment infrastructure.

Ecosystem principle

A platform can potentially influence downstream competition through control over:

Distribution + payments + technical access + contractual rules.

The court's findings and legal conclusions should be distinguished carefully: the case did not establish that every App Store restriction is automatically unlawful under antitrust law.

22. United States v. Microsoft

Case: United States v. Microsoft Corp., 253 F.3d 34 (D.C. Cir. 2001).

Facts

Microsoft possessed substantial power in the PC operating-system market.

The case concerned Microsoft's conduct toward browser competitors, particularly Netscape.

Competition concerns

The government challenged Microsoft's use of contractual and technical strategies to protect the Windows ecosystem.

Legal significance

The case is foundational for understanding:

• platform dominance;
• technological tying;
• exclusionary contracts;
• network effects;
• distribution advantages; and
• leveraging of operating-system power.

Ecosystem principle

A dominant platform can have unusual competitive power because control over the platform provides access to a large installed base.

23. Comparative Case-Law Matrix

24. Cumulative Effects of Ecosystem Exclusion

One of the most important issues is that exclusion may not result from a single conduct.

Consider:

Default placement + tying + data advantage + interoperability restrictions + exclusivity + switching costs

Individually, each practice might appear relatively limited. Collectively, they may reinforce one another.

This produces an ecosystem foreclosure loop:

Dominant platform

↓

Control over distribution

↓

Preferential treatment of own services

↓

More users

↓

More data

↓

More developers/sellers

↓

Greater network effects

↓

Higher switching costs

↓

Reduced rival entry

↓

Further ecosystem dominance

Competition authorities therefore increasingly need to consider cumulative foreclosure effects.

25. Relevant-Market Definition Problems

Ecosystems complicate traditional market definition.

Possible markets may include:

A. Platform market

Example: mobile operating systems.

B. Complementary market

Example: mobile payment services.

C. Distribution market

Example: app distribution.

D. Advertising market

Example: digital advertising.

E. Data-related market

Example: commercial data access.

F. Aftermarket

Example: services connected to an installed device base.

G. Ecosystem-level competition

In some circumstances, competition may occur between entire ecosystems rather than individual products.

For example:

Apple ecosystem ↔ Android ecosystem

However, competition authorities must still determine the legally relevant market rather than automatically treating an entire ecosystem as one market.

26. Network Effects and Entry Barriers

Ecosystem exclusion can create significant entry barriers.

Suppose a new platform needs:

• users to attract developers;
• developers to attract users;
• data to improve services;
• services to attract advertisers; and
• advertisers to finance the platform.

The resulting problem is a chicken-and-egg barrier.

A dominant ecosystem can make entry harder by preventing rivals from obtaining sufficient scale.

27. Switching Costs and Consumer Lock-In

Exclusion becomes more significant when consumers cannot easily switch.

Examples include:

• proprietary file formats;
• non-portable data;
• incompatible applications;
• accumulated loyalty points;
• device-specific purchases;
• subscription bundles;
• contractual commitments; and
• loss of social or professional networks.

Competition law may therefore consider whether ecosystem design creates artificial switching costs rather than merely normal product differentiation.

28. Interoperability as a Competition Remedy

Competition authorities may consider interoperability remedies where exclusion results from technical barriers.

Possible remedies include:

1. API access

Competitors may receive access to relevant technical interfaces.

2. Data portability

Users may be permitted to transfer data to competing services.

3. Technical compatibility

The dominant platform may be required to maintain interoperability.

4. Non-discriminatory access

Comparable competitors may receive comparable technical access.

5. Anti-steering obligations

Businesses may be allowed to communicate alternative purchasing options.

29. Structural Remedies

In particularly serious cases, authorities may consider:

• divestiture;
• separation of platform and downstream operations;
• prohibition of acquisitions;
• functional separation; or
• restrictions on cross-use of data.

Structural remedies are generally more intrusive than behavioural remedies and require careful assessment of proportionality and effectiveness.

30. Legitimate Business Justifications

Not every ecosystem restriction violates competition law.

An undertaking may have legitimate reasons for:

• security;
• privacy;
• fraud prevention;
• system integrity;
• cybersecurity;
• product quality;
• technical compatibility;
• protection of intellectual property;
• prevention of malware; or
• consumer safety.

For example, an app-store restriction may have legitimate security benefits.

The competition question is whether the stated justification is:

1. genuine;
2. connected to a legitimate objective;
3. supported by evidence; and
4. proportionate to the restriction.

31. Competition Law Test for Ecosystem Exclusion

A useful analytical framework is:

Step 1 — Identify the ecosystem

Determine:

• core platform;
• complementary services;
• users;
• business users;
• infrastructure;
• data;
• distribution channels.

Step 2 — Identify market power

Examine:

• market shares;
• network effects;
• switching costs;
• entry barriers;
• data advantages;
• user dependence; and
• control over infrastructure.

Step 3 — Identify the exclusion mechanism

Determine whether the conduct involves:

• tying;
• bundling;
• self-preferencing;
• exclusivity;
• refusal to deal;
• interoperability restrictions;
• discriminatory access;
• defaults;
• data leveraging;
• anti-steering; or
• technical degradation.

Step 4 — Examine foreclosure

Ask:

Does the conduct materially reduce competitors' ability or incentive to compete?

Step 5 — Examine competitive effects

Consider:

• entry;
• innovation;
• prices;
• quality;
• choice;
• privacy;
• interoperability;
• investment; and
• long-term competition.

Step 6 — Consider justification

Determine whether the restriction is reasonably necessary for:

• security;
• privacy;
• technical integrity;
• quality;
• fraud prevention; or other legitimate objectives.

Step 7 — Select remedy

Potential remedies include:

• behavioural commitments;
• interoperability;
• access obligations;
• data portability;
• non-discrimination;
• anti-steering;
• prohibition of exclusivity;
• monitoring; or
• structural separation.

32. Key Antitrust Concerns

The principal competition concerns generated by ecosystem exclusion mechanisms can therefore be summarized as follows:

1. Leveraging

Market power in one market is used to obtain or protect power in another.

2. Foreclosure

Competitors are denied sufficient access to customers, data, infrastructure or distribution.

3. Self-preferencing

The platform disadvantages rivals while promoting its own downstream services.

4. Lock-in

Users and businesses become dependent on the ecosystem.

5. Network-effect reinforcement

Exclusion increases the ecosystem's existing network advantages.

6. Data advantages

The ecosystem operator gains information unavailable to rivals.

7. Innovation suppression

Potential entrants may abandon development because access to users is restricted.

8. Interoperability degradation

Technical restrictions prevent competing products from functioning effectively.

9. Raising rivals' costs

Competitors remain technically present but face substantially greater costs.

10. Entry deterrence

Potential competitors may conclude that successful entry is commercially impossible.

33. Emerging Issues

Future ecosystem-antitrust disputes are likely to involve:

• AI foundation-model ecosystems;
• AI assistants and operating systems;
• cloud-computing ecosystems;
• app stores;
• digital wallets;
• connected vehicles;
• smart-home ecosystems;
• IoT platforms;
• wearable-device ecosystems;
• digital identity systems;
• health-data platforms;
• blockchain ecosystems;
• crypto exchanges;
• advertising technology;
• retail-media ecosystems;
• super-apps; and
• interoperable digital public infrastructure.

AI ecosystems are particularly significant because a single undertaking may control:

Model → compute → cloud → API → application → distribution → user data.

That vertical structure creates new opportunities for both legitimate integration and potentially exclusionary leveraging.

34. Conclusion

Ecosystem exclusion mechanisms represent a major evolution in competition law because market power increasingly derives from control over interconnected systems rather than from ownership of a single product.

The principal legal concerns are:

tying + self-preferencing + interoperability restrictions + exclusivity + data leveraging + defaults + access discrimination + lock-in.

The leading cases—including Microsoft, Google Android, Google Shopping, Amazon, Slovak Telekom, Bronner, IMS Health, Qualcomm, Intel, Epic Games v Apple, and US v Microsoft—demonstrate different dimensions of this problem.

The central competition-law challenge is to distinguish efficient ecosystem integration from strategic ecosystem foreclosure. Competition authorities must therefore examine not merely whether a platform is large, but how control of the ecosystem affects access, interoperability, data, distribution, innovation, entry and the ability of rival ecosystems to develop.