I think the situation with anti-cheat on Linux is changing. Studios are putting resources into anti-cheat that will work on Linux. If I'm being a bit cynical, I could say this is "just" because of Steam Deck and Steam Machine, but I think the number of potential players switching to Linux right now outside of the Steam ecosystem is starting to be worth considering.
The only way they could even consider making it work would involve blessing certain kernel builds, and their integrity would need to be verified. If I am able to swap out the kernel, anti-cheat cannot be effective.