I can go and make an NFT by absolutely any artist I want and there's nothing that can be done to stop me. Nobody is forcing me to provide several levels of documentation to prove my identity before selling my image online.
In fact, it's pretty much daily that I see fellow artists warning people that fake NFTs are being sold in their name.
A signed inkjet print is harder to forge than an NFT. A hand-written signature is possible to forge, but it's substantially harder to forge than a copy-pasted digital file.
I mean, there are documented cases of it happening as well[1]. Faking an NFT is an incredibly easy way to get rich and there's no liability. It's wonderful for scammers.