I think ISPs limit the usefulness of this since they rotate IPs so often. I tried it because I knew I didn't have any torrents downloaded in the last year at least, but last week it shows a Jurrasic World download
ISPs don't limit the usefulness of this as much as private trackers that do; my IP address is completely clean but if you look at my Transmission you'll be surprised ;)
All private trackers have that (otherwise the private tracker is irrelevant), the torrent file just flags DHT off as well as any other decentralized peer discovery.
