I think it must be quite complicated to implement. Torrents traditionally work on static data. An ISO image or mpeg4 doesn’t change, so the hash locks in the content and makes it possible to share pieces and assemble them with integrity checking. I have no idea how they are doing that with a webpage, which could potentially change every second. I don’t know if they have a way to add updates to a torrent of an existing page, or if they construct a new torrent on a snapshot basis.