Lorenzo Miro San Diego first learned about Polymarket after seeing the prediction market on an episode of "South Park" last fall. His first wager: $498 on the University of Houston beating Oregon State in a college football game. He netted more than $100 after the odds shifted further in Houston's favor. For the next two months, things didn't work out as well. He lost money, on net, on a series of bets related to professional football and basketball. He also began dabbling in cryptocurrency