A Yield Sec study commissioned by the European Casino Association estimated that illegal gambling accounted for 71% of the European Union’s online market in 2024. It also reported €20bn in lost tax revenue; both figures are the study’s estimates.
The estimates bear on operators’ exposure to competition from illegal online gambling across the EU.
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A report cited in a press account estimates that unregulated online gambling generated $5.9tn worldwide in 2025, up from $5.7tn in 2024. A separate estimate puts illegal operators at 17% of Europe’s online gambling market in 2024, with €80.6bn in gross gaming revenue; the report cautions that measurement methods differ.
An industry analysis cited in a Brazilian article put the illegal betting market at 41% to 51% of the sector in June 2025. Yield Sec projections using first- and second-quarter data suggested the share could rise to 74% in Q3 2026; the article also estimated annual tax losses of R$7.2bn to R$10bn.
A bill before Brazil’s Senate proposes prohibiting advertising and sponsorship related to sports betting and online gaming. The proposal is awaiting a rapporteur in the Constitution and Justice Committee after the Science and Technology Committee backed a substitute; estimates cited in the report put potential annual losses for Serie A clubs at up to R$1 billion.
The Campaign for Fairer Gambling said illegal sports streaming is helping expand illegal gambling. Its report says 89% of illegal sports streams carried illegal-gambling advertising in 2024 and the first half of 2025, while British audiences watched 4.7 billion illegal sports streams over that period.
The Campaign for Fairer Gambling said its report, based on data from the first half of 2025, estimated offshore operators held 9% of the UK gaming market. The report also linked 89% of illegal sports-stream views to illegal gambling, according to the account of its findings.