When the federal ban on sports wagering was rescinded in 2018, there was a sprint to the marketplace, with states eager to leap headfirst into the gambling business. And since then, there has been a steady trickle of new states opening their doors to gambling operators such as Caesars and MGM. Some 112 million Americans — more than a third of the population — can now legally wager on sports without leaving their couch. Another 50 million need only hop in their car to place an in-person bet.