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The investment banking and capital markets firm Jefferies said in a September report that sports had become prediction markets’ “most important liquidity driver”, with combo and parlay-style contracts accounting for an increasing share of activity. But the analysts cautioned that prediction markets are scale businesses with relatively low revenue yields, leaving their economics dependent on sustained liquidity, engagement and trading activity.

James Monk, founder of sports data and streaming provider Catalist Sports, has witnessed that dependence directly. Catalist supplies ITF tennis data to Kalshi and Polymarket and has an exclusive US sports-streaming agreement with Kalshi.

The company must also provide data to the firms making markets on those events.

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AI is used, but only towards the end of the process. First, the system gathers objective indicators; AI is then used to assess the overall pattern and probability of a connection. “We only provide evidence-based findings,” Madsen says. “We don’t say that something is a mirror site because we suspect it is. It is only reported when we are 100% confident there is a match.”

The timing is significant. The illegal gambling market is attracting growing attention from regulators and the wider industry, while estimates of its size vary considerably depending on definitions and methodology.

A recent Fincord Intelligence report highlighted by the Betting and Gaming Council estimated that illegal online gambling generated around $50 billion in gross revenue globally in 2025. It estimated that around 5,000 operator structures were using more than 15,000 websites and apps.

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She adds: “For example, Transavia also had 4,000 people, cabin crew, cockpit, and more, all very regulated, labour union intensive, people being busy with what can we offer to the guests – but at the same time they have to know their rules and their regulations very well, because it’s important when there’s risk attached.

“I had never been a CEO before so I came to it with a kind of Pippi Longstocking attitude – ‘I’ve never done it, but I’m sure I can do it!’”

We mentioned that southern border because German players apparently enjoy the Holland Casino offering too. “German visitors are really interested because we have a different offer from most of the German casinos,” Petra explains.