For years, online gambling operators serving German players without a domestic licence had wagered on a simple legal bet: that their EU licences – most commonly issued in Malta – would shield them from civil liability under German law. Recently, the European Court of Justice (ECJ) called their bluff.

There had already been legal movement in this direction, with another Global Gaming Insider contributor, Dr Joerg Hofmann, advising that the industry should not yet consider this an emergency alarm. Developments since, however, have moved matters forward somewhat. 

In its long-awaited ruling in case C-440/23, the court Confirmed that Germany’s pre-2021 prohibition on online casino games was fully compatible with EU law. More consequentially for the industry, the ECJ ruled that EU law does not prevent Germany from enforcing the civil consequences of that ban – including declaring contracts void and ordering the refund of lost stakes. The operators’ reliance on European freedom-of-services provisions, it turns out, was never the safe harbour they imagined.

A dam-breaking ruling

Operators believed their EU freedom-of-services argument was bulletproof. But the ECJ has just dismantled it completely.
The ruling’s significance extends far beyond the individual case, which was referred from a Maltese civil court and concerned a German consumer’s claim for restitution of losses incurred at an unlicensed online casino. Tens of thousands of similar proceedings are pending before German courts, many of which had been formally suspended pending the ECJ’s guidance. Those cases can now resume – and the direction of travel is unmistakable.

Indeed, we are talking about hundreds of thousands of affected players across Germany. When you aggregate those individual claims, you arrive at potential liability in the billions. Providers who assumed this legal risk would never fully crystallise are now confronting a very different reality.

The legal mechanics underpinning the refund claims are straightforward. Contracts between players and unlicensed operators were void from the outset under § 134 of the German Civil Code, which invalidates agreements that violate statutory prohibitions. The consequence — a claim for restitution of payments made under a void contract — flows directly from §§ 812 et seq. of the Civil Code. The Federal Court of Justice had already signalled as much in its landmark guidance ruling of March 2024 (Az. I ZR 88/23), and this latest ECJ judgment now furnishes the definitive European law foundation.

Operator arguments falling on deaf ears

A key fallback argument deployed by operators — the so-called § 817 sentence 2 defence, which holds that a party who itself acted unlawfully cannot seek restitution — has fared no better. German appellate courts, including the Higher Regional Court of Brandenburg in a June 2025 ruling, had already rejected this argument systematically. Today’s ECJ ruling, by confirming that the players’ claims do not constitute an abuse of EU law, further rejected that line of defence.

The statutory limitation period for losses incurred in 2016 expires at the end of this year. Under § 852 of the German Civil Code, a 10-year residual period has protected older claims — but that window is closing. Players who hesitate now may lose their right to recover forever, which means operators should brace for a new wave of cases.
One significant question remains unresolved. A parallel ECJ case — C-530/24 — addresses online sports betting, where the legal landscape differs in important respects. Advocate General Emiliou delivered his conclusions in that case on 19 March 2026, and the legal community broadly expects the outcome to echo Thursday’s reasoning. But a formal judgment is not anticipated before 2027.

So, while this ruling covers online casinos, sports betting players may not sit back and wait for C-530/24. The legal basis for their claims under German law is already strong, and the same limitation deadlines apply. Anyone who lost money with an unlicensed operator — casino or sportsbook — could be taking legal advice now.
For an industry that long relied on regulatory ambiguity as a form of protection, this latest ruling represents a decisive shift. The ECJ has answered the question that had kept thousands of cases in legal limbo. The dam is now broken.