Do they have any evidence that DRM is important for this? It baffles me that the music industry was very quick to discard DRM despite being the loudest opponen

Do they have any evidence that DRM is important for this? It baffles me that the music industry was very quick to discard DRM despite being the loudest opponent of piracy for a while, and yet everyone else is still locking down their content. And no, before someone mentions it, streaming was absolutely not a factor in their decision at the time.