But if you were, say, The Pirate Bay and all you are pinning is the torrent file then it seems like that might have worked as torrents are only a few kb in size

But if you were, say, The Pirate Bay and all you are pinning is the torrent file then it seems like that might have worked as torrents are only a few kb in size rather than a Gb movie file? What was the name of the site?