Comment by dinedal

> I could give you a huge explanation involving relay points and NAT traversal etc. but at the end of the day, these challenges have been defeated.

[citation needed]

All of them (to my knowledge, and yes, I've researched this) still require some sort of central network that gets contacted first. "Trackerless" bit torrent, for example, uses a DHT that is hosted by... bittorrent.com