Except a lot of anti cheat now supports Linux. Destiny 2 doesn’t run on Linux only because Bungie refuses to allow it, their AC supports Linux just fine now
there is also other games that dont run on linux
Roblox (sober works which is a workaround),Fortnite (Tim Sweeney hates linux from what i heard),and more
But the steam deck really disproves the notion that Linux can’t run these games. The companies that make them choose not to support Linux, and in that way its not really Linux’s fault that the games don’t work.