A federal court has issued a preliminary injunction barring Kalshi from offering sports event contracts on the lands of plaintiff California tribes, converting what had been a voluntary restriction into a binding court mandate. The order requires Kalshi to report its compliance steps within 21 days. The ruling marks a significant escalation in the legal battle between prediction market platforms and tribal gaming authorities in California, where tribes operate casinos under federally protected sovereign land rights that limit state-regulated gambling activities.