I've seen a couple floating around every now and then.
Fluo is dead probably because it's a system. Everybody knows what roles there are, which makes it tough for the mafia to safeclaim. It would probably just be easier to just show which factions are in the game and let the mafia safeclaim any role.
A fundamental problem I see with RTMs is that it requires you to pay attention for the entire game; if there are any distractions in real life bothering the player, the player may overlook some important information and eventually just cost a game. People are busy with school, jobs, family events, so it might be why there are less people willing to play.