I think its a combination of that and games moving from community run servers (named things like “Gregz Hangout | Gungame 24/7 | No isms” ) to just clicking a matchmaking button and being dropped into a match with a bunch of people you’ve never seen before and will never see again after that game is over.

With the server model occasionally people join or leave, but you’ll likely see most of the same people over several matches and maps. And if you rejoin that server another day because you liked it you might see that some of those people came back for the same reasons that you did.