It works well in practice. The DHT protocol includes announce messages that broadcast when new files are shared on BitTorrent. It then includes a "geometric" way to find people who are sharing those files. It doesn't include the files themselves, just the torrents which include a file list and location hashes.
If you listen to BitTorrent's DHT network, you'll build an index of everything shared on BitTorrent (over time), this will include commercial movies and such.
If you listen to BitTorrent's DHT network, you'll build an index of everything shared on BitTorrent (over time), this will include commercial movies and such.