COMPLETLELY DONE with APEX S25

"there is also FPS onlinegames with a visible ELO/MMR Rating and the amount of lowballing MMR is very low."

This depends entirely on how you define lowballing. Yes, it's any kind of punch-pulling behavior a player may exhibit, but it's also smurfing. Which is rampant in this game. All my matches are me solo queueing and paired up with teammates who have banners that say "I just started playing this game two weeks ago." One in ten of those players started playing two weeks ago. The other nine drop solo, drop hot, get two full squad wipes by themselves, and then quit the second they get downed. Okay, 1:9 may be a slight exaggeration, but 3:7 isn't. At all. And like I said, the squad wipes would cause that account mmr to move up pretty quickly, but the quitting early is a behavior, conscious or not, that helps keep it from skyrocketing overnight. But why would the player care anyway when they can set up a new account in five minutes and just keep the whole thing going forever?

You may well be right that most players wouldn't be bothered to manipulate their mmr if they knew what it was. Maybe the people that I observe are the exception rather than the rule, and the reason I see so many of them is because by definition they'll be most obvious in the lower end of the spectrum. But I have a hard time believing that players who seem to have zero compunction about cheating the game in every possible way would somehow be oblivious to the possibilities of mmr manipulation, or too lazy to try it.