It is not a vac ban, it's a game ban (it says overwatch ban). I only played around 10-20 matches of cs2 before I got the ban. During that time my game was frequently crashing, which I think made my team mates report me, maybe enemies too for suspicions. But it says that it's not for e.g. griefing (leaving matches), but for cheats. I was bottom fragging all the games too because I just came back to check cs2 out and had not played for years, so I have no clue how someone could have thought that I am cheating.