Not at all. You can hash a document that contains the rights to IPFS and embed that file hash on the NFT itself. I can imagine in the future we will see license

Not at all. You can hash a document that contains the rights to IPFS and embed that file hash on the NFT itself. I can imagine in the future we will see license agreements similar to how open source software has MIT, Apache, GNU, etc delineated by a LICENSE.md file in the root directory of the repo. It removes all ambiguity. It's even defensible in court. The burned Banksy also had a digital representation attached to the NFT. The Jack Dorsey tweet was sold by the man himself. He verified it on his own social network. In that sense the Jack Dorsey NFT is as good as an autographed Babe Ruth baseball.