Valve Working With Rockstar to Fix GTA Online on Steam Deck
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Valve Working With Rockstar to Fix GTA Online on Steam Deck - Steam Deck HQ
https://steamdeckhq.com/news/valve-rockstar-fix-gta-online-steam-deck/
GTA Online may be playable on the Steam Deck again in the future, since it seems like Valve is working with Rockstar to possibly fix this.