NFTs alone don't do anything special, other than enable trading of NFTs. The NFT basically has a "memo" field where the issuer can put a link to a website that

NFTs alone don't do anything special, other than enable trading of NFTs. The NFT basically has a "memo" field where the issuer can put a link to a website that says "This NFT represents the source code for the world wide web", but that's it. You don't actually get or own anything beyond the NFT. You can think of it like a digital baseball card that represents something. The advantage is that it's digitally unique and can be traded on the blockchain. It's likely that these high dollar auctions come attached to contracts with additional stipulations beyond the NFT. I wouldn't be surprised if those contracts included clauses that allowed re-issue of the NFT in the event that it's lose or stolen, for example.