I don't see why you're surprised? MP doesn't control PvP games, and barely takes up any bandwidth for them (vs taking a dice bet), doesn't affect investors, and is hard to regulate. If they did, I'm guessing many apps would just use MP as a deposit system, like BitLegit did a while ago. It's easier for them to not take anything for both players, and app owners (that want to avoid the payment). Running a game like Poker, for example, requires a server from the game creator, so the cost is increased for them.