IIRC Overwatch's anti-cheat is also entirely user-space and server-side, and I encounter relativly few cheaters in Master to GM lobbies. Not to say there aren't

IIRC Overwatch's anti-cheat is also entirely user-space and server-side, and I encounter relativly few cheaters in Master to GM lobbies. Not to say there aren't any (there most certainly are), but there are so few that are noticable that it honestly is negligible IMO.