Recently, i had to move from nixos to windows against my will simpy because of anti cheats. While i dont game that much, the few games i enjoy playing are all online with some kind of anti cheat. I used to dual boot but i was tired of having to wait for my slow hdd to load windows (i only have one ssd). I literally used linux for everything else but because of anti cheats i am forced to move to windows. I managed to make it a little better by using wsl2 and removing bloatware but it will never be the same as linux
Those anti cheat games usually need to opt in to supporting Proton/WINE. For Easy Anti Cheat (perhaps the biggest one out there), devs just need to tick a build option to support it, but then they feel obligated to do QA for it, so the option stays off until the higher ups decide to formally support that configuration.
So it’s not that it’s hard to mess it up, it’s just hard to convince higher ups to allow their game to work on Linux.
If a AAA MP game doesn’t work on Linux, it’s probably intentional.