Iowa Electronic Markets still exists. No need to give the commercial prediction markets any leeway.

IEM is still functioning but pretty dead since Kalshi put up election markets. Looking just now I see well under $100 in volume for all of August. (At least when Kalshi first put up those markets it gave me the only opportunity I've had to make a pure arbitrage.)

Might be something the populace is just too dumb to have - the people seem to overwhelmingly prefer their events to be pretty much games of chance (BTC price up/down at 15 minute intervals) or sports.

I figure Kalshi and Polymarket for dead before too long, if only because the "traditional" sportsbooks seem to have much better "government relations".