Kalshi and Polymarket are introducing new trading restrictions after growing concerns that users may have been betting with insider knowledge. Recent cases, including well-timed bets on geopolitical events, raised serious questions about whether these platforms were being used to profit from confidential information.

Now, both platforms are tightening the rules — banning political candidates, athletes, and anyone who could influence outcomes, while also targeting trades based on leaked or illegal information. It’s a clear signal that prediction markets are moving from “anything goes” experimentation to stricter, more regulated environments.