you can make a signed readonly linux installation, and restrict your games to it. this would be like "support steamos but not linux".

Or deliver the game as a container format, like snap or appimage to bypass most of the system.

Or demand the installation of a kernel driver like they do on windows.

or just give up on kernel level aticheat since they're been breached all the same, just as windows are restricting their power too.

easy-anticheat has a linux version. Developers have to disable the support intentionally.