TikTok's bid to shed its "gatekeeper" label under EU law has suffered a setback. An adviser to the EU's top court has backed the European Commission's decision to designate the platform under the Digital Markets Act (DMA).

The opinion comes from an Advocate General at the Court of Justice of the European Union in Luxembourg. Advocate Generals don't decide cases. They advise the judges, and those judges follow the advice in the large majority of matters. A full ruling will follow in the coming months.

Why does the gatekeeper label matter?

The DMA is the EU's competition rulebook for Big Tech. A "gatekeeper" is a company controlling a core platform service — think of an online gateway so dominant that other businesses can't realistically avoid it. The label carries hard obligations. Gatekeepers must share data with rivals, allow users to install third-party apps in some circumstances, and refrain from favouring their own services in rankings.

TikTok, owned by China's ByteDance, challenged its designation before the EU's General Court. The company argued it doesn't hold the entrenched market power the DMA targets. Its point: the platform is a challenger in social media, not an incumbent. It grew fast, but it remains, in its view, outside the small club the law was written for.

The Commission saw it differently. It designated TikTok as a gatekeeper after the platform crossed the DMA's quantitative thresholds — 75 million monthly EU users and a €7.5 billion European turnover. Once those numbers trigger designation, the Commission can also apply a qualitative assessment to confirm the label.

What did the court adviser say?

The Advocate General sided with the Commission's approach. The core of the advice: TikTok's designation stands on solid legal ground, and the Commission acted within its powers when it applied the DMA to the platform.

For TikTok, the timing stings. The company wants to be treated as a disruptor. The adviser's message is effectively the opposite — user numbers and market position, not company self-image, drive the analysis.

An Advocate General's opinion isn't binding. The Court of Justice will deliver the final judgment, usually three to six months after the opinion. But reversal is rare. Practitioners treat these opinions as a strong directional signal.

What does this mean for practitioners?

Three practical points follow.

• Compliance stays mandatory. TikTok must keep meeting its DMA obligations while the case runs. Nothing in the opinion suspends enforcement.
• Threshold challenges look weak. Other platforms weighing similar suits now face an adverse signal on the merits of contesting designation.
• The Commission's toolkit is intact. The advice preserves the regulator's ability to designate fast-growing platforms, not just long-established incumbents.

For antitrust teams advising tech clients, the message is blunt. If you cross the DMA's user and revenue thresholds in the EU, you should plan for gatekeeper obligations — and budget for them — rather than bet on litigation to remove the label.

What happens next?

The Court of Justice will now deliberate. Its judgment will close TikTok's appeal, which followed an earlier defeat at the General Court, the EU's lower-instance court in Luxembourg. That court already dismissed TikTok's challenge, prompting the appeal now before the higher court.

A final loss would leave TikTok with no further EU judicial avenue on this designation. The platform could still seek future review if market conditions change, but the immediate legal fight would be over.

The case also matters beyond TikTok. It's the first wave of DMA litigation testing how the Commission's newest competition instrument holds up in court. A confirmation from the Court of Justice would cement the DMA's foundations. Tech-sector lawyers across Brussels are watching closely.

The opinion doesn't make headlines for TikTok's users. It makes headlines for the company's compliance bill — and for every platform wondering whether it's next on the Commission's list.