i think your underwstimating the anticheat value that still exists. many of the online games are trash when theres not strict cheat control.
Private servers are a nice way to do this and do still exist in places. My favorite online game uses them along with server side anti-cheat and while cheating occasionally happens, it has never been an ongoing issue. I've maybe seen a cheater once or twice in all my many hours playing the game over 10 years (elite dangerous, in case you were curious).
What exactly separates a kernel dev from a non-kernel dev?
Or trying to do heists and having a cheater in every session.
I'd like to play the game again but it's just not fun.