Because anyone can mint an NFT, whether they have a license or not, so it would require a bureaucracy to check the validity of the NFTs, and so on, in other wor

Because anyone can mint an NFT, whether they have a license or not, so it would require a bureaucracy to check the validity of the NFTs, and so on, in other words a central authority. And if the system relies on a central authority then it makes no sense to trade the licenses on a blockchain, as the blockchain only adds an unnecessary step. Skip the blockchain and go directly to the central authority.