Decentralized proof of ownership only matters if people with guns think it matters.

I saw a short video of Keanu Reeves laughing at NFTs because they had value but are easy to copy.

Which I found somewhat funny. Keanu gets paid a lot because he acts in things that have value but are easy to copy (movies).

The reason why those have a high value is because of copyright. The people that financed the film have control over the copying of the film. Because people with guns agree with the copyright scheme (US government).

NFTs cannot have actual value unless people with the ability to enforce that scarcity cares about them.