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Rockstar Games DDoSed Heavily By Players Protesting New AntiCheat Code
(cyberinsider.com)
This is a most excellent place for technology news and articles.
I'm unsure if GTA V was ever Steamdeck Certified, but I imagine it might have to do with that. They may only offer this for games they said were certified and the devs broke it after the fact. I know Monster Hunter was.