CS:GO on Linux is actually not launching Trusted Mode by default - quick fix
Looks like Valve did a bit of a woopsie. With the recent updates to Counter-Strike: Global Offensive they implemented a new anti-cheat tool with Trusted Mode but it appears at some point they forgot to enable it.
How to setup OpenMW for modern Morrowind on Linux / SteamOS and Steam Deck
How to install Hollow Knight: Silksong mods on Linux, SteamOS and Steam Deck