If I wanted to reboot to play a particular game, I can do that now without anyone bringing KAC to Linux. I have found that I won't reboot just to do a single activity, I will avoid that activity.

Which in this case is fine, because I avoid kernal level anti-cheat like the plague in principle. It doesn't actually work and gives far more access to my system than I am willing to some random game dev/publisher just so they can claim the game doesn't have cheaters (and the playerbase complains about smurfs instead of hackers because they drink the KAC koolaid).