In order to stop Apex Legends’ Linux cheating problem, Respawn is pulling support for the Steam Deck.
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Unfortunately, though, unless you’re a bit tech savvy, you now won’t be able to – Apex Legends is currently officially available via Steam, and as such has been a game you can play on Valve’s handheld, the Steam Deck.
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Sorry, Steam Deck players!
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There is currently no reliable way for us to differentiate a legitimate Steam Deck from a malicious cheat claiming to be a Steam Deck (via Linux).”