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I would guess Bethesda would have to pull the add-ons part, which is where you get other things like Quake 64 and have to disable the Beth.Net authentication check that happens when you boot Quake Remastered/Enhanced.

And then they (Bethesda) would probably have to provide a DRM-FREE installers and DRM-FREE versions of Quake 64 and any add-ons also to GOG.