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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The only reason they really have to not switch over is "needing" resources for extra OS support. But I think what they don't understand is the independence of most linux users. The people that use linux know that they aren't the normal user base, and are okay with the problem possibly being on their end. But when it's blatant that they do not want to commit for a lack of control, that's a bad sign for the perceived intentions of the company.