Your example is practical, and something I might even like to use. In theory, each user could run their own Usernet server and that could be called P2P. But if

Your example is practical, and something I might even like to use. In theory, each user could run their own Usernet server and that could be called P2P. But if the default configuration is to use a shared server, it doesn't sound P2P to me. I will read up more on Usenet though. I have used it but don't know its internals.