Do you have anything more tangible than "lol"? Looking at the most played steam charts, there is about 10% that has anticheat that does not work on linux.
In the top 10 I see only 3: pubg, apex, and rust (no idea about delta force) but unplayable on the steam deck and whether the anticheat filters out linux are not the same.
https://store.steampowered.com/charts/mostplayed