Ignoring one smaller market while gleefully supporting another, Epic Games have announced they're getting Fortnite along with Epic Online Services Anti-Cheat on Windows Arm.
There are so many variations/forks/distros of Linux that it is basically impossible to control the gameplay experience (prevent cheating) in a way that Epic want to. At least that's what they say.
Honestly, that's a pretty idiotic point. Going by that logic, it would also mean that cheating itself would be hard, since not every cheat/hack would work on every system.
Honestly, the main system they would need to work with is the Proton environment. And even games that don't have a native runtime have no problems with more hackers.
It's the same reason why some developers only allow the Steam deck to run their game: they think all Linux users are hackers and would either put pirated copies of their game in the internet or cheat in their games with ease.