If the digital art is displayed on a website then anyone can copy it.
This is where you are missing the point. Yes, you can copy it but NFT's origin guarantees it being unique and having history ownership.
What's the point of having a file if it has no value? And you have no value because you can't sell the file, only the NFT.
It would be interesting to see some NFT display with encryption included and so. I believe in the future we'll have more privacy regarding NFTs and art so it's not even displayed in full resolution or full colors or similar.
You are incorrect.
NFT does not prove ownership.
As proof, I uploaded this image to a digital art website and it now has an NFT token address.
