Valve Anti-Cheat (VAC) hasn't been doing too hot lately. First, the anti-cheat issued bans to those using AMD's Anti-Lag+ feature in Counter-Strike 2. Now, VAC is issuing bans for setting your mouse DPI too high.
The issue with Anti-Lag+ was due to how AMD implemented the feature into a variety of games. It altered or hooked into game files, which is a big no-no when it comes to playing games that are supported...