The soccer coach had blocked himself from sportsbooks by the time he found prediction markets.

The tax accountant said he “got the same high” on those platforms that he got from gambling. “That was how I relapsed — with Kalshi and Polymarket. I lost a bunch of money.”

The rapid growth of prediction markets has sparked a high-stakes debate that is playing out in courts and legislatures all over the country. Operators of those companies believe they should be regulated like the stock exchange because of federal law and their customer-to-customer structure, while sportsbooks and state officials think they should be supervised the same way as sports gambling platforms.

While that argument continues with no sign of resolution, the clinicians who treat gambling disorders are more concerned about what they are seeing with their patients.…