Hacker ethos is about freedom to control what you own and put it to the purposes that you, its owner, want. DRM takes away that freedom, so it is obviously incompatible.
If that freedom makes e.g. Disney business model unsustainable, then that business model is itself incompatible with the ethos.
If that freedom makes e.g. Disney business model unsustainable, then that business model is itself incompatible with the ethos.