You do realize that replicas are a problem in the real world art world as well right?
In real world art this is resolved by proving providence, in crypto providence from minting is trivial, but you still need to prove providence that the minting was honest.
None of which in any way responds to what I said. NFTs, by design, have no fraud prevention mechanism and no mechanism for getting your money back if you were scammed. They allow for arbitrarily many tokens to be minted of the same thing, with no obvious mechanism for people to realize that's what's happening.
Smart contracts can and do limit the amount which can be minted. And fraud exists everywhere, regardless of institutional controls - this is where community matters.
Sure, but it has a different address...there is no possibility of confusion. Something from the 1950s is not going to be confused with something from the 1980s, especially with a blockchain timestamp.
On the other hand, it's trivial to show that an NFT is authentic and not a replica. The difficult part, as always with cryptography, is linking a public key to a know identity.
If you have a trusted channel from the artist (e.g. their twitter feed) it's trivial for them to indicate that a given public key/wallet address is theirs and therefore anything minted on there is authentic and anything minted elsewhere is not.
Determining if a real world piece of art is a replica or authentic can be fairly expensive. Determining if an NFT is authentic is much much cheaper.
In real world art this is resolved by proving providence, in crypto providence from minting is trivial, but you still need to prove providence that the minting was honest.