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How to play Rainbow Reels
Strip away the language of contracts, order books and event trading and Bernard Marantelli has a blunt description of what is happening inside US sports prediction markets. “Kalshi is a sportsbook that’s just not allowed to have an in-house risk team,” says the founder of White Swan Data, one of the specialist firms now making markets on prediction exchanges.
The difference is all about the risk function. A sportsbook employs traders to price bets and manage its exposure. An exchange provides an API through which firms compete to quote prices and supply liquidity.
“Here’s an API. Bernard and 88 other people can market-make all these request-for-quotes (RFQs),” Marantelli says. “Some people might come in and just do esports because they’re esports experts. Others do everything. Some focus on same-game parlays. But it’s a sportsbook.”
About Rainbow Reels
“These were serious breaches by Dabble. Wagering providers must have robust systems in place to protect people who have chosen to self-exclude,” Lidgerwood added.
Tabcorp Holdings Limited, one of Australia’s largest wagering and media companies was also fined more than AU$2.7 million earlier this year. ACMA clarified that Tabcorp had violated telemarketing and spam regulations over a 16-month period.
It had sent over 217,000 marketing emails and SMS messages within a 16-day window to customers who had explicitly unsubscribed. ACMA regarded the volume and timing of these messages as significant enough to warrant enforcement action.
What is Rainbow Reels?
Compared to the 2021 licensing round, the KSA adopted a more granular and stringent approach to its licence renewal process. This was expected following new policy rules set out by the regulator in September 2025.
One such rule was for licensees that had faced compliance enforcement during the five years operating in the Netherlands.
At the time KSA announced: “Providers that made mistakes in the past five years must explain during the application process how they have learned from previous mistakes and how they intend to prevent recurrence. If we find this explanation insufficient, the permit may be denied or additional conditions and restrictions may be imposed.”
