Introducing CS Rating—a precise display of your skill in Counter-Strike 2. With regional and World Leaderboards you'll know exactly how you stack up.Competit...
Counter-Strike 2 will give players a rank for each individual map. Players will also receive a single rank based on the Premiere mode (pick-and-ban maps for each match).
Maybe they support VAC on proton in general. But since CS:GO/CS:2 has Linux support they don’t enable VAC on proton. That’s my guess without checking.
I’m pretty sure they have, I was already playing csgo on proton some years back.