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Stars Sell Sex & Gambling: Prediction Markets' New Tactic
10 Sep
Summary
- Prediction markets are using celebrity endorsements to boost user engagement.
- Ads feature stars like Sydney Sweeney and LeBron James, drawing criticism.
- The industry faces legal battles over whether it's gambling or financial products.

Prediction markets are significantly increasing their marketing spend, enlisting A-list celebrities to promote their platforms. Recent advertisements have featured actress Sydney Sweeney for Novig and LeBron James alongside other stars for Polymarket, drawing public criticism. These high-profile campaigns coincide with the rapid growth of prediction markets across the United States, despite significant legal and regulatory challenges.
Companies like Kalshi and Polymarket, each valued at approximately $20 billion, are investing heavily in celebrity endorsements. These efforts often target major sports seasons, as sports-related contracts are a substantial driver of activity. Past campaigns have included Lionel Messi for Kalshi leading up to the World Cup and Timothée Chalamet in earlier promotions.
The aggressive marketing push occurs as prediction markets navigate increasing legal uncertainty. A recent Ninth Circuit ruling stated Nevada could enforce its gambling laws against Kalshi's sports contracts, rejecting federal preemption claims. This creates a division among appellate courts, potentially leading the dispute over industry regulation to the Supreme Court.