10. Mark Hunt
This is one of the more recent examples. Mark Hunt alleged that the UFC knew that Brock Lesnar would fail a drug test, so they did everything they could to avoid tests and/or keep the results buried until after the fight. Sure enough, Brock tests positive. So he came in, made millions, screwed over a legend like Hunt, then bailed to ride out his drug suspension that’s going to be up soon enough anyways.
Mark wanted a piece of Brock’s purse, but ultimately ended up with nothing but a loss on the record to someone that was allegedly protected and allowed to use steroids in the first place.