Basically, one distro or a few(at most) may get anti-cheat integrated one day(like, say, SteamOS), but it will likely never be in your standard Linux kernal.

Valve also has server side anticheat in his games (Counter Strike or Deadlock). They are also against it.

Kernel-level anticheats can be bypassed anyways, but they are the easy solution for the corps that want to sell their multiplayer game.

If I am not planning to go back there anytime soon, i wouldn't bother sharing my honest opinion tbh. And even if I do, I am not sure it's worth going through the awkward situation with the waitress.

Its' strange that they let her keep her phone in that tiny cell. In any case, they are all very brave when the offender is a 55kg young girl.