Another way to go, if you could truly get all the captains on board from the beginning, is to simply default all of your lines when you play them. Each team that does that is kicked out of the league for that season, but at the end of the season his guys have zero matches played and all are ineligible for playoffs. Pretty dramatic so you’d better be serious about your convictions. The teams in our league did that one Fall season against a captain whose team was clearly tanking, just declined to play them. It worked.