There is none.
Yes. Kernel Access needs root in general and that anti cheat is always run as user in wine. So the fix in proton is simply that the syscalls, which are requested by “nProtect GameGuard”, can now be requested correctly. More or less it gets replicated/faked, since that are then not real kernel calls as on windows.
However such a approach can break easily, since not intended… Meaning that the game won’t start in the future.