NFT is just a label attached to an item - for ex. digital art.
There is no easy way to identify who minted the nft - the artist, the market place or somebody else.
Most of the digital art items attached to nft-s are crappy art which somehow gets a very significant value.
Even though the nft-s were supposed to be for a single item (1 copy only), some artists sell multiple copies of the same item.