German authorities have uncovered an alleged illegal online gambling network that processed more than €5.8 billion in wagers between mid-2021 and the end of 2023. The investigation led to searches at 11 properties across Frankfurt and the wider Rhine-Main region, with more than 100 officers involved.

The Frankfurt public prosecutor’s office coordinated the operation with the Frankfurt tax investigation unit, the State Office for Combating Financial Crime in North Rhine-Westphalia and Frankfurt police. Authorities executed an arrest warrant and seized luxury vehicles, while freezing bank accounts and imposing an asset restraint covering approximately €82 million.

Investigators identified five suspects who allegedly operated online gambling services without the required German licences from at least July 2021. The case also includes suspected tax evasion, with authorities estimating a tax shortfall of about €77.6 million for 2024.

“In addition to the search warrants, an asset seizure for a total of approx. 82 million euros was executed,” investigators said, according to the German Press Agency.

The size of the alleged operation has prompted renewed discussion over the scale of Germany’s illegal gambling market and the effectiveness of its current regulatory framework.

Investigation Raises Questions Over Black-Market Size

The German Sports Betting Association (DSVW) welcomed the enforcement action and said the findings should lead authorities to reassess existing estimates of illegal gambling activity.

“This successful investigation clearly demonstrates the scale that the illegal gambling market has now reached. We strongly welcome the fact that law enforcement agencies are taking decisive action in this area.”

As reported by SBC News, DSWV President Mathias Dahms also pointed to the amount of wagering identified in a single investigation.

“Nearly €6bn in wagers over two-and-a-half years in a single investigation must prompt a critical review of previous assumptions about the size of the black market.

“If even a single case reveals such proportions, it inevitably raises the question of whether previous black market estimates realistically reflect the actual scope of the illegal market.”

Licensed operators must follow requirements intended to protect players, while unlicensed services can operate outside those controls. The DSWV specifically highlighted measures such as deposit limits, identity verification and player suspension tools.

The issue is significant given Germany’s relatively low channelisation rate. H2 Gambling Capital estimated in 2025 that only between 22% and 25% of online slots activity went through licensed operators, with the rate potentially falling to 20% by 2030 if key reforms do not occur.

Online Casino Licensing Faces Renewed Scrutiny

The German Online Casino Association also backed the investigation while using the findings to question the country’s current approach to online casino regulation.

DOCV board member Kevin O’Neal compared the scale of the investigation with estimates from the Joint Gambling Authority of the Federal States. The GGL’s 2025 activity report placed the illegal market share at 23% in 2024, representing €547 million in gross gaming revenue. Nielsen data cited by the association put the figure at approximately 56%.

“The figures from the investigation do not match the estimates of the authority. This difference is too large and must be explained by the GGL. Your figures paint too small a picture of the black market,” he added.

The DOCV has called for a nationwide licensing model for online casino games. Under the current framework, online poker and virtual slot games operate under nationwide regulation, while casino games remain subject to individual state oversight.

O’Neal argued that the limited availability of licences leaves significant activity outside the regulated market.

“The evaluation of the Interstate Treaty on Gambling must therefore launch a nationwide licensing model for online casino games,” he said.

The association also wants stronger enforcement measures against illegal operators, including closer cooperation with search engines and changes to criminal law. It argues that payment blocking and geoblocking alone cannot address the issue.

Germany is already reviewing its Interstate Treaty on Gambling, with the evaluation scheduled to conclude by the end of 2026. Regulators have also changed online slot rules this year. In July, the GGL replaced the previous €1 maximum stake with a tiered system. Players under 21 remain limited to €1 per spin, while those aged 21 and above can wager up to €3. Players aged 21 or older who show no signs of harmful gambling behaviour over 90 days can wager up to €5.

Financial Crime Risks Extend Beyond Gambling Accounts

The investigation comes shortly after international financial crime analysis identified gambling as an area requiring increased attention from regulators and law enforcement.

The assessment drew on information from more than 80 jurisdictions, along with contributions from industry organisations, researchers and private-sector stakeholders. It examined casinos, sports betting, online gambling and gaming, with illegal gambling identified as a significant risk in multiple jurisdictions.

Authorities have been advised to look for activity such as deposits from several third-party accounts, multiple accounts registered under different identities and repeated VPN use. Deposits followed by withdrawals with little or no gambling activity can also indicate suspicious behaviour.

The assessment identified cash, e-wallets, mobile money and virtual assets as payment channels that can present money-laundering risks. Online gambling can also facilitate rapid cross-border transfers, while connections with other digital platforms may provide additional opportunities for illicit activity.

Ownership arrangements represent another area of concern. Complex structures, nominees, trusts and foundations can make it harder to identify beneficial owners or may be designed to avoid regulatory thresholds. Authorities have also been encouraged to examine relationships with third-party providers and white-label businesses where oversight is limited.

The international assessment noted that illegal gambling markets can rival or exceed licensed markets in some jurisdictions. Offshore operators may attract customers through anonymity and promotional incentives while operating outside national licensing requirements.

The broader risks have led to calls for stronger cooperation between regulators, law enforcement and private companies. For Germany, the €5.8 billion investigation has added weight to existing arguments over how the country measures illegal gambling and how it licenses online casino activity.

O’Neal said: “Without question, this access is a success. But it also shows that the illegal online gambling market is flourishing and the extent to which organized crime has reached in the illegal online gambling market.”