Valve doesn’t do kernel level anti cheat on Windows either. Those are the actual roadblocks.
Userland anti cheats can work (and do) on Linux if the developers want to. Most of the third party ones the developer buys/licenses already do.
But reality is that only the kernel level ones seem to work to some extent. Difference in the amount cheating between counter strike and valorant is just massive (both free to play games)
Yeah, user-space anti-cheats just aren't as effective. We need kernel-level anti-cheats on Linux, and more. I understand these are considered invasive, but people care FAR more about cheaters than they do the extremely remote possibility of a zero-day exploit.