It’s also not clear at all which law in which jurisdiction this would be a violation of. It’s akin to a web link, which aren’t illegal anywhere AFAIK.
Sure, just like the music/film industry targetted Pirate Bay as a central place for sharing torrent files, the same thing can happen with OpenSea.
The more important point I'm making is that the fact that anyone can deploy their own EIP-721 contract means that there has to be central agreement about which is the legitimate version of an NFT. I find this to be an amusing property for a, supposedly, decentralised system.