Exactly. This is trivial to carry out and can be done "by hand" between two browsers. I don't know what the OP is talking about. They are speaking as if the commonly chosen mode of bootstrapping a connection is fundamental to the entire communication cycle. It's flat out not true. When the connection has been established, peers are connected directly, but by their definition, this doesn't matter because a trusted peer was used to form the initial connection. Ridiculous. By that logic, it wouldn't be a P2P connection if IPs were initially exchanged by snail mail or carrier pigeon, or if DNS were used.