Creators are unwillingly and contra to economic systems that have evolved over a few millennia entered in the Borg or the Matrix. So their achievements are reused for private and public benefits without their permission. Piracy is theft. And this piracy is a bigger theft than piracy on an individual download basis. Was there any doubt? (Linguistically I agree that you can’t “rob culture”. You can rape or reap culture though, and that is the point at hand.)