I took a quick look at the Tent docs.
My first thought: if we didn’t have email, and we asked someone to design email, they’d come up with this.
They’d use REST, JSON, HTTPS, and OAuth. People would be addressed by a URL.
But set the modern bits aside, and it’s still much like email or Usenet. Servers talking to servers. People using client apps. No centralized authority.
A whole lot of the internet works this way.