Some of us knew this 30 years ago

> Again: the goal of DRM is not to stop illegal activity completely, it's to make it less widespread.

It doesn't even do that. In vast majority of cases DRM is broken, and those digital materials are pirated ever since. You can argue that DRM reduces piracy on the period from when it's introduced to the point when a way to break it is found. But it's a bad justification, since it's a very negligible gain in comparison with crippling the experience for legitimate users. And in most cases DRM is broken pretty fast.