

That’s not what P2P means though. With Usenet, the articles are stored on a server, and you download them from the server. P2P always means one peer directly connects to another. The reason P2P systems exist is that they avoid things like takedowns (since you’d need to take down every user instead of a central server), and Usenet doesn’t have that advantage.
If Usenet is P2P, then every other system that lets people upload files is P2P, including things like Rapidshare, Google Drive, forums, etc. That wouldn’t make sense.









This is describing federation and decentralization, not P2P. The servers communicate with each other. P2P is when users communicate directly.
Would you consider Lemmy or email as P2P? They’re also federated and decentralized.
Your definition of “server P2P” doesn’t really make sense. Any CDN would fit this definition for example, because CDN edge servers fill data from origin servers when it’s not cached locally, and a lot of that data would be user-uploaded, but I’m not sure anyone would describe Akamai, Fastly, or Cloudflare as P2P.
Usenet has companies running the servers, and you download from and upload to the company’s servers. Nobody would reasonably describe that as P2P, regardless of how the servers are implemented.