Grand Theft Auto V, Steam Deck
According to Valve, though, Rockstar could solve this minor technical issue with a single email.
An anti-cheat called BattlEye from an outside company has been added to Grand Theft Auto V on PC. This may be intended as a ...
Rockstar Games dropped Steam Deck compatibility for GTA V and GTA Online following a recent BattlEye anti-cheat update.
It appears that GTA 5 BattlEye anti-cheat has been added by Rockstar, as both the Steam backend and player reports indicate it's in-game.