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Destiny 2 uses the BattleEye anti-cheat software, which Valve would happily support as it said it would any anti-cheat solution. Such a stance by Bungie makes little sense. Steam Deck will allow you to install Windows, so that's potentially one workaround, but Bungie threatening a ban for even trying will discourage most players from attempting this.
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However, Bungie also issued a warning: "Players who attempt to bypass Destiny 2 incompatibility will be met with a game ban."
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Steam Deck is an open platform, though, so a few players will understandably think they could work around the incompatibilities. Players who attempt to launch Destiny 2 on the Steam Deck through SteamOS or Proton will be unable to enter the game and will be returned to their game library after a short time."
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On the Destiny 2 Steam Guide page, Bungie added the following note regarding Steam Deck compatibility: "Destiny 2 is not supported for play on the Steam Deck or on any system utilizing Steam Play's Proton unless Windows is installed and running.
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