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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I would love to be able to play via Proton, as things stand it feels like enabling proton support with the new expansion would be a great move it would enable a wider range of players to enjoy the game with minimal additional work. And a large number of anti cheat solutions already have linux support so it shouldn't have an adverse effect on the current player experience.