Because a "copy of the art" is a work of art that is the same as the original art and an NFT is not a work or art and is not the same as the original art. An N

Because a "copy of the art" is a work of art that is the same as the original art and an NFT is not a work or art and is not the same as the original art. An NFT is a virtual token, than may or may not contain some metadata. This is not the same thing as the original art. Therefore it is not a copy of the art.