In the NHL they tried to force the players to wear pride-colored jerseys in the pre-skate. One of the Flyers refused and said, people can believe what they want, but I will not be bullied into wearing their colors in the pre-game skate. His Flyers jersey immediately became one of the best-selling jerseys in the league.

I guess the league can promote whatever they want, but don't expect the players to join in.