They're closing the door. They've made it to where they're at. They want to make sure that they stay where they're at. It wouldn't do to let anyone roll in behind them unless those people have the same ideals. The only option is to set up a system where you have to play the game if you want to get anywhere. They've been building it for a while but this is one of the last (if not the last) nail in the coffin.