There's nothing about publicly tracking "ownership" metadata for a piece of media that actually prevents you from copying its bits. The only way I can see that even beginning to work is with DRM hardware that respects the blockchain. I can only see that as a dystopia.
I'm holding myself from stronger language because it's possible I'm misunderstanding something, not having followed the whole NFT thing closely, but based on my understanding of what computers and cryptography can actually enforce in the real world, this seems like nonsense.