For those unaware, BattlEye has recently announced that they are added support for Steam's Proton Linux compatibility layer. This allows Linux users to play some Windows games on Linux. At the moment, playing Destiny 2 is not possible as the anti-cheat gets flagged.
This new added support for Proton is on an op-in basis, and as far as I'm aware, it is simple to opt-in.
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bumping this again, although I'm sure there are tons of other threads on this exact thing. SteamDeck is generally available. Common Bungie, do the bit o' work to make BattleEye work with Proton and move forward. Linux users are way less scary than those M$ fellows.