A few decades ago, we had more of a bell curve of gameplay styles among MUSH/MUX games.
TTRPG/often-PVP games on one end, full-consent on the other. One highly authoritative (through GMs or code), the other highly collaborative (at least until you hit a wall and someone picked up their toys and went home.)
Both extremes were (and probably still are) super popular among a subset of players, but had dramatic issues. TTRPG/PVP games became known for capricious behavior. Full-consent games often devolved like schoolkids playing cops and robbers. “I got you!” “Did not!” “Did so!”
So over time, we saw a shift toward the middle. Fewer headaches for staff, more agency for players to run their own plots (since GM staff became harder to come by), and a wider appeal to potential players (which became even more important as MU populations dwindled.)
That’s not to say you can’t make a successful game in the margins these days. I just don’t think the shift to the middle was random, or the result of PVP players going to video games or whatever. I think it was just collective experience into what kinds of games appealed broadly and weren’t nightmares to run.