[gcbw3]

you should forget whatever you read and start over :)

The purpose of it is exactly to help you find other peers with the same content. It's a bunch of peer finding protocols on top of each other. Trackers, DHT, peer xchange, etc, etc

I mean, the data itself is all hashes, but very public hashes. Unless you hashed it yourself and shared only the hash ever, the reverse hash is a websearch away.