Some of us knew this 30 years ago

"Again, DRM for rentals hinders mostly illegal activities - like saving a rented movie permanently."

I think the point is that it doesn't hinder illegal activities. If you're just going to ignore the law, you don't rent from a legal service in the first place - you go straight to the Pirate Bay et al. The only effect of DRM is to get in the way of people who've already made an active choice to try to co-operate with the media owners.