Grand Theft Auto Online has, in an eyebrow-raising move, been given an anti-cheat software named BattlEye over a decade after the game came out. As a consequence, it's now officially no longer compatible with the Steam Deck, per Valve's own store page for the game and an official FAQ from Rockstar.
That's a pretty dramatic shift, considering GTA 5—and, likely, GTA Online—was formerly one of Valve's top-played Steam Deck games. It's even still on the leaderboards at the time of writing. Now, it's got a big ol' "unsupported" sticker.
