But by taking money in exchange for a transaction that persists on a blockchain that separates OpenSea from, say, Pirate Bay. It was free to create an account and upload a torrent file and then the sharing occurred off-platform. But since OpenSea operates in the same way as any web 2.0 platform — providing an API that interacts with the thing that does the hosting/sharing — it's more liable to things like copywrite infringement.