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.
You can easily copy the CryptoPunk contract and mint your own token[1], but the new token will be very easy to spot as a fake (as it will have a different contract address), and will have no market value, and likely zero buyers.
Compare this to physical prints, which can and often are forged in such a way that the original becomes very difficult if not impossible to detect.[2]
EDIT: The Banksy example you gave is one of impersonating the artist, rather than forging an artwork, and depends on the artist's accounts or website becoming compromised. It's not something NFT as a technology prevents; and, of course, the same problem could have occurred had it been a physical print sale distributed via the website.
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.
[1] https://www.bbc.com/news/technology-58399338