The fact they mentioned "anti cheat", it's going to be your modern online multiplayer games. It's going to be games like Fortnite, PUBG, Call of Duty, Battlefield, etc.

I recently found a neat list of games that don't work due to Anti-Cheat:

https://areweanticheatyet.com/

So it's probably one of the ~700 games.

Not the original commenter, but for me it's Arc Raiders. I'm a fan of extraction shooters and have been messing with the idea of fully switching to Linux and ditching microslop completely, aaaaaaand then Arc Raiders was released

You must not play most of the top 5 fps games then lol.

Literally everything a "normal" gamer plays is not supported on linux.

Not the original commenter, but my current ones are, EAs WRC it doesn't work on Linux and the clubs feature is used by a couple of communities and is a great way to have current rallies.

Raceroom is not great on Linux, very crashy. But it can work at least.

I am also deep into Le Mans Ultimate, which just added EAC, and Devs have said they will not support linux. Currently it still works, but I am expecting that to end sometime soon.

For my hobby there isn't really alternatives, iRacing doesn't work, AC Rally is just too early and doesn't have anything outside of leaderboards (and that doesn't even have friend filtering). In terms of Sim racing there isn't much that works really well on Linux and can't exactly get the same experience in other games, like a 24hr race with driver swaps, ranked racing with multi class.