Wouldn't it be great if there was an underlying messaging framework that allowed anyone to host any kind of site or forum, with built-in interoperability, flexi

Wouldn't it be great if there was an underlying messaging framework that allowed anyone to host any kind of site or forum, with built-in interoperability, flexible curation, and the ability to impose moderation? Then anyone (with servers, perhaps) could make their own blog (only they send messages, except perhaps comments), Twitter, Hacker News, Element, whatever. Pipe dream?