[emdowling]

Amongst other reasons, lack of support for anti-cheat systems (like EAC and BattleEye) have stopped big-name games like Destiny 2, Fortnite and others from easily porting to Linux. The Steam Deck has started to change that, prompting the ecosystem to slowly come around.

[saltminer]

Both BattlEye and EAC support Linux (https://www.gamingonlinux.com/2022/02/proton-7-easy-anti-che...), it's up to the companies using it to allow it.

[Closi]

I think the point is that they have supported it for about 2 weeks rather than 2 years, so the picture on compatibility is changing but not there yet.