On July 26, Netflix premiered the documentary film Instadocs: The Prediction Games, which explores the phenomenon of the booming prediction markets. The film features insights from Kalshi and Polymarket CEOs Tarek Mansour and Shane Kaplan, along with Michael Seliga, the chairman of the U.S. regulatory body CFTC.
In its announcement, Netflix highlighted that the trading volume of contracts for the 2026 World Cup final exceeded $5.6 billion across both platforms.
However, just two days before the premiere, Kalshi sent a letter to Netflix threatening legal action and demanding the removal of the film's trailer, claiming the material was fabricated, according to CNN. The trailer shows party guests in a mansion in Las Vegas discussing their trades and winnings on Kalshi during the 2026 World Cup final, while a Nevada court, in response to a lawsuit from the gaming regulator NGCB, mandated the platform to block contracts on sports events for local users.
Kalshi stated that the check shown in the trailer relates to a contract purchase from May 16, 2025, well before the ban. However, the trailer creates the impression that its owner was trading sports contracts in Nevada in violation of the court ruling. Netflix responded that they did not fabricate any footage, and the key trades featured in the trailer were made in 2025, prior to the restrictions coming into effect.
Despite the complaint, Netflix released the film on schedule and, at the time of publication, had not removed the trailer.