No Idea! But I kind of like playing Multiplayer shooters anonymously. TF2 and BCBF2 both have clear enough objectives and roles that tons of teamwork happen with no communication.
When I first saw MUDs I was excited at the prospect of an RPG where you weren’t across the table from your friends — I hoped not only for more immersion, but for the ability to really role-play freely without going easy on your friend or wasting time rules lawyering. Of course, that’s not really what happens.