NFTs are paying for a signature in a blockchain that links to a random URL. If you're lucky, it's IPFS and it'll go down when people stop hosting it. If you're slightly less lucky, it's whatever platform you went through that's operating an IPFS tunnel because cryptobros can't figure it out, and it will go down whenever your flavor or the month NFT site goes out of business, which is any time between six months and 5 years. IF you're even less unlucky, it's just a random link to a website, and I can't wait for people's art to be replaced with penises because that's what happens to hotlinkers.