In this articleHOODPat Freiermuth #88 of the Pittsburgh Steelers runs the ball during the fourth quarter of the NFL 2025 game against the Miami Dolphins at Acrisure Stadium on Dec. 15, 2025 in Pittsburgh, Pennsylvania.Lauren Leigh Bacho | Getty ImagesRobinhood is stepping up the capabilities of its fastest growing product — prediction markets — by giving users the ability to place what are essential parlay bets on multiple NFL games, putting it into direct competition with traditional sports books.Starting ...