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).

You can always do that though since you can dualboot to whatever other system you want. I thought their idea was to have a mode you turn on and off in your main system, but I think that's just how kernel anti-cheat would already work.