NFT value is not the artwork, it’s the provenance.
If I possessed the technical means to produce an exact copy of the Mona Lisa, brush stroke by brush stroke and pigment by pigment, it would still be worth only a fraction of what the true Mona Lisa is worth.
The Mona Lisa’s value is inextricably tied to its creator and its history.
NFTs provide irrefutable provenance regarding a digital image’s creator, time of creation, ownership history, etc. Nothing more and nothing less. But there can be great value in that.