In every Major League Baseball clubhouse, a sign with Major League Rule 21(d) is prominently posted.

The rule deals with gambling. It says that any player, umpire, or employee of a team or the league who bets on a game they’re not involved in will be banned from MLB for a year; if they are involved in the game, the ban is for life.

Elsewhere in these ballparks are gambling signs of a different kind: ads and sponsorship logos for DraftKings, BetMGM, FanDuel, and the like.