Kalshi and Polymarket Are Spoiling Reality TV Shows — and Studios Don’t Know What to Do About It

May 22, 2026 11:12am PT Kalshi and Polymarket Are Spoiling Reality TV Shows — and Studios Don’t Know What to Do About It

By Ethan Shanfeld, Selome Hailu

The winner of CBS’ “Survivor 50” was announced live on air on May 20.

But traders on prediction market platforms Kalshi and Polymarket — and “Survivor” fans exposed to reports of the fluctuating odds — saw Aubry Bracco’s payday coming before the season even began.

When a “Survivor 50” market opened on Kalshi six weeks before the Feb. 25 season premiere, preliminary trades forecast Bracco to have a 61% chance of winning — nearly double the odds of her next closest competitor. By Jan. 28, she had jumped to 83%. And on Feb. 28, just days after the premiere and before Bracco had accumulated much screen time, a user bet $45,500 she would win the season (which later earned them a profit of $4,500). By market’s close on the day of the finale, a staggering $32.7 million in wagers had lifted her odds to 97%. (On Polymarket, “Survivor 50” predictions only reached a trade volume of $1.9 million, but the odds followed a similar trajectory.)

For anyone following along, Bracco seemed all but certain to be crowned the Sole Survivor. Minutes before the finale, Kalshi goaded in a push notification: “Is the island already decided?”

Pretaped reality TV shows are facing an unforeseen problem: Prediction markets are spoiling their endings. It’s not just “Survivor”: Kalshi users correctly predicted Galaxy Girl, at 91% odds, would win this season’s “Masked Singer” three months before Ashlee Simpson removed her space-themed costume in the finale. The site similarly spoiled the winner of “Next Level Chef” in February, though the season didn’t conclude until May 21. And Doug Mason, a contestant on the ill-fated Season 22 of “The Bachelorette,” peaked at 89.5% on Polymarket and 93% on Kalshi before ABC canceled the premiere. The season may never air, but to find out who received the final rose, just follow the money.

By way of blogs like RealitySteve and Reddit pages like SpoiledSurvivor, there’s a long history of unscripted shows being spoiled on the internet. Networks tend to assume these leaks spring from cast members. But “Survivor 50” contestants were sent home in July 2025 without being told the winner; they had to wait until the live finale to see host Jeff Probst read the votes onstage. That means only a select number of “Survivor” staffers had knowledge of Bracco’s victory — forcing CBS, a source says, to reckon with the fact that any leak would have had to come from production.

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Insider trading is banned on both Kalshi and Polymarket, and Kalshi’s head of communications, Elisabeth Diana, says the platform uses AI-powered third-party surveillance to detect suspicious transactions. The company has repeatedly assured that it’s investigating its “Survivor” market. (Reps for Polymarket did not respond to a request for comment.)

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