Do you think there are ways to prove copyright and identities, inside and outside the online world, without KYC?
1. Generate a pair of public/private keys for some asymmetric encryption scheme.
2. Embed the public keys into your digitalized work of art.
3. Put the digitalized work of art (including the embedded keys) onto a popular blockchain.
Aaaaand you essentially get NFTs :-)
Alternatively if you don't want to put it onto a blockchain, you can
1. Generate a pair of public/private keys for some asymmetric encryption scheme.
2. Embed the public keys into your digitalized work of art using
steganography3. Distribute your digitalized work of art.
When someone asks you to prove that the work of art is yours, extract the steganographically hidden public keys and show that you own the private key without revealing it, e.g. by signing a message with your private key and letting everyone check the signed message using the public key.
However when your work of art is not on the blockchain, after you prove once that you own the work of art, everyone will know how the public key is hidden, so someone might remove your public key and replace it with his own public key and claim to own the work of art. Someone could do that with an NFT too, but at least people would be able to see which NFT has been put on the chain first, which means that it is original and the later one is a copy.
Regarding KYCs, they are bad indeed, but you don't really need to KYC your identity in order to create an NFT.