Germany’s €5.86B Illegal Casino Bust Sparks Questions Over Black-Market Estimates

German authorities have dismantled an alleged illegal online casino group that handled €5.86 billion (US$6.9 billion) in wagers. The sheer scale of the operation has prompted the country’s regulated industry to repeat claims that authorities have significantly underestimated the size of the black market.

More than 100 police officers, prosecutors, and tax investigators participated in raids on 11 residential and commercial properties in Frankfurt, the wider Rhine-Main region, and Cologne last week.

Five suspects are accused of operating multiple illegal gambling websites, primarily offering virtual slots, since at least July 2021.

One alleged ringleader was arrested under a warrant issued by the Frankfurt District Court.

German prosecutors are not naming the suspects or the gambling websites allegedly involved.

The operation allegedly accepted €5.86 billion in wagers between July 2021 and December 2023 alone, according to authorities, who also allege the suspects evaded gambling taxes, with the tax loss estimated at €77.6 million ($90 million) in 2024.

Investigators secured assets worth around €82 million ($95 million), froze bank accounts, and seized several luxury vehicles.

Estimates Challenged

The German Online Casino Association (DOCV), which represents the regulated online gaming industry, seized on the latest investigation as further evidence that Germany may be underestimating its black-market problem.

Earlier this year, a study commissioned by Germany’s gambling regulator, the Gemeinsame Glücksspielbehörde der Länder (GGL), estimated that unlicensed operators accounted for around 23% of the country’s online gambling gross gaming revenue (GGR) in 2024.

That translated to approximately €547 million ($633 million) in illegal GGR.

Meanwhile, a 2025 study commissioned by the DOCV and German Sports Betting Association (DSWV) estimated that unlicensed operators accounted for around 56% of Germany’s online gambling market.

DOCV executive committee member Kevin O’Neal said the figures uncovered by investigators did not fit with official estimates of the black market and called for changes to Germany’s gambling regulatory system.

“Without question, this operation is a success. But it also shows that the illegal online gambling market is flourishing…” O’Neal said.

“The figures from the investigation do not fit with the authority’s estimates. This discrepancy is too large and must be explained by the GGL. Its figures paint too small a picture of the black market.”

Scale of Betting Laid Bare

The network allegedly processed an average of approximately €2.34 billion ($2.7 billion) in wagers annually during the 30-month period identified by prosecutors.

For comparison, Germany’s entire regulated online slots market recorded approximately €4.57 billion ($5.3 billion) in stakes during 2025.

That means the alleged illegal network’s annualized betting volume was equivalent to more than half the stakes handled by Germany’s entire regulated online slots market last year.