Nothing prevents someone from making copies and selling each "unique" one.
Since it is decentralized, there is no centralized authority to take down the copies (that is, a DMCA-style take down).
The "no one can censor you" upsides of decentralization are not without downsides: you cannot censor or take down others, even in cases of copyright breach.
- giving artists a way for protecting their art.
On the contrary it seems...
The only thing I would be surprised with, is that anyone would actually be surprised by this.
Fast and easy: digitally sign raw bytes.
Slow and hard: verify that the creator of the asset is the creator of NFT (and ignoring trivial digital transforms)
Latest South Park TV-movie gets it right again: https://v.redd.it/4j3ovwqpzy581
Can't wait for the cases of heavily invested NFT owners asserting copyright ownership because "they spent more"... Anyone betting the starving artists come out on top when those cases happen?