It's not a problem on a rooted phone, irrespective of what app developer decides or wants. And as I've mentioned, at a pinch, just photograph the screen with another device.

These days, just about anyone can copy anything that the DMCA covers despite any attempts to protect it. The answer is elsewhere, that is copyright laws have to be updated to be equitable to everyone. Unfortunately, it's dinosaurs like the RIAA who are standing in the way stopping it.