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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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By leaning into that imperfection, players may then exploit the knowledge and tip the house edge in their favor. Most casinos and courts around the world consider this to be cheating.
However, the judgment in that specific case against Star Casino ruled that Grant was a self-professed advantage player, and that a casino where the staff was competent and the games were operated correctly had nothing to worry about.
Grant has maintained that advantage play is not “dishonest or cheating” ever since his first legal brush with Star Casino.
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“There are significant checks on individuals and businesses before a licence is granted,” he says. “The UK Gambling Commission has set out what it expects. If you want a licence in the UK, you need to meet those expectations.”
Bentley believes regulated operators are genuinely trying to do the right thing but says some mistakes could be mitigated through better automation and continuous monitoring. Enforcement statements also provide lessons that businesses should use to test their own exposure.
“It would be crazy to say that these cases are positive for the industry,” he says. “They will no doubt continue, but as an industry we need to try to reduce their frequency.”