The devs were testing out FACEIT anti-cheat (which won’t work on Linux and also has a bad reputation as a rootkit) a while back but . If they do decide to implement FACEIT later on, that would lock all Linux gamers out of the official servers. Apparently the community servers might still run EAC after that and therefore possibly be usable with Linux though.

So it works on Linux for now but there’s no certainty about the future until the devs unveil their plans further.