The mechanism: Sports betting legality in the U.S. isn't a single federal switch — it's 50 separate state decisions, made possible after the Supreme Court struck down the federal ban on state-authorized sports gambling in Murphy v. NCAA (2018). Since then, roughly 38 states plus D.C. have legalized it, but each one sets its own tax rate, licensing structure, and market-access rules, and several (Texas, California, Georgia, Missouri's neighbors) still don't allow mobile wagering at all. For a company like PENN Entertainment, whose regional casinos are mature, low-growth cash generators, the real swing factor in earnings isn't slot-machine foot traffic — it's whether the next state legislature opens mobile sports betting, and at what tax rate. PENN licensed the ESPN name for its online sportsbook ("ESPN Bet") specifically to buy customer-acquisition leverage in that fight, turning a regional gaming operator into a bet on state-by-state regulatory expansion.