At the very least, this would change the design constraints of the problem. Right now it's easy to push off communication-security questions because "generally,

At the very least, this would change the design constraints of the problem. Right now it's easy to push off communication-security questions because "generally, mostly, kinda" the network can be trusted to deliver your information without snooping or tampering. In an environment where there was no pretense of this trust, it seems that good design would call for more robust security in order to transit over a wholly untrusted network. That said, this network looks mighty inefficient. It looks like the terrible early days of decentralized P2P filesharing where all nodes were equal and routing barely worked. That didn't clear up until they backpedaled a bit with superpeer-type setups, which brought things back more like the Internet diagram in this article.