It’s the Wild West of online betting. Prediction markets have been plagued by insider trading allegations, ethical questions and even national security concerns. Today on the show, what are sites like Polymarket doing to self-police, and what other regulations might be necessary? We talk to one U.S. senator with some ideas. The Indicator has a weekly newsletter! Sign up now: npr.org/indicatornewsletter Related: Is anyone gonna do anything about…