The Bottom Line
- Algorithm Audits Are Now Essential: Dominant digital platforms must now urgently review and potentially re-engineer their search and ranking algorithms to ensure they do not unfairly favour their own products or services. Non-compliance is a direct route to massive fines.
- Increased Litigation Risk: This ruling creates a powerful precedent. Expect a new wave of private damages claims from third-party sellers and competitors who believe they have been commercially harmed by biased platform mechanics.
- A Level Playing Field: For smaller businesses operating on major platforms, this judgment provides significant new leverage. It strengthens their ability to challenge practices that suppress their visibility and confirms that platform “gatekeepers” have a special responsibility not to distort competition.
The Details
In a landmark decision (joined cases T-620/23, T-1023/23, T-483/24), the EU’s General Court has delivered a sharp warning to major digital platforms. The Court found that a dominant online marketplace had abused its market position by systematically using its search algorithm to favour its own in-house products over those of third-party sellers. The core issue was not that the platform was competing, but how it was competing. By manipulating the very infrastructure of the marketplace, it was not competing on the merits of its products but was instead leveraging its structural power to guarantee itself a commercial advantage, a practice the Court deemed anti-competitive.
The Court’s legal reasoning focused on the “special responsibility” held by a dominant undertaking under Article 102 of the Treaty on the Functioning of the European Union (TFEU). The judges determined that the platform was not merely a seller but a “gatekeeper” that set the rules of competition for thousands of other businesses. By engaging in self-preferencing, it distorted the level playing field it claimed to provide, effectively making it impossible for third-party products to compete fairly, even when they were of higher quality or lower price. The Court dismissed the argument that the algorithm was a protected “business secret,” ruling that its anti-competitive effects were what mattered for legal scrutiny.
This judgment significantly reinforces the regulatory direction established by the EU’s Digital Markets Act (DMA). It sends a clear signal that both the European Commission and the EU Courts are prepared to look “under the hood” of complex algorithms to police anti-competitive behaviour. For CEOs and legal counsel at any large-scale digital platform, this means the era of algorithmic “black boxes” is over. Internal business logic that promotes self-interest at the expense of fair market access is now a clearly defined and high-stakes legal liability.
Source: General Court of the European Union
