Comment by anonymoushn

People really are writing tokens with custom transfer functions that do this sort of thing. The main use case seems to be allowing artists to collect fees on non-first sales of an NFT. This whole genre of program is a bit suspect to me though, because if you had a trusted counterparty or an escrow you could just sell them the private key for the account containing the NFT, and they could conduct a "sale" for $1 to their own wallet.