Some anticheats like EAC, GameGuard, XingCode do have Linux support that the game has to opt-in. I believe it is not kernel-based and is not Linux-native. Many non-competitive games do allow them.
At least I know that Helldivers 2 (GameGuard), DJMax Respect V (XingCode), Fantasy Life I (EAC) do works on Linux.
I wish that if they're happy with non kernel mode anti cheat on Linux, just do the same in Windows... Or just disable them if I don't use public matchmaking
EAC is owned by Epic, but they won't enable it on their own games, because they don't want to make it easy for people to use Steam. They want Epic Games to used for more than collecting free games and launching Fortnite.
Kernel-based on Linux is pointless unless SacureBoot is used with fixed vendor certs (you can still SB custom kernels on most consumer mobos). I believe that only Microsoft exists in the default certs, so impossible for all intents and purposes. Otherwise you can modify the kernel (or Wine/Proton) and do what you want.
Windows has the same issue, but isn't open source and easy to modify. Still, EA are so paranoid that they require it there.
At least I know that Helldivers 2 (GameGuard), DJMax Respect V (XingCode), Fantasy Life I (EAC) do works on Linux.
I wish that if they're happy with non kernel mode anti cheat on Linux, just do the same in Windows... Or just disable them if I don't use public matchmaking