NFTs are just proof of ownership in a purely digital realm. Aside from the "contents" of an NFT, it is proof that the holder is a customer, or provides a prove

NFTs are just proof of ownership in a purely digital realm. Aside from the "contents" of an NFT, it is proof that the holder is a customer, or provides a provenance chain of ownership from the original customer. Advantages exist for both the customer and the seller. Far from useless.