Gemini is a bit like that (on a small scale). Basically everyone have their own tiny server somewhere to post on, and there is a widely adopted standard for how

Gemini is a bit like that (on a small scale). Basically everyone have their own tiny server somewhere to post on, and there is a widely adopted standard for how to publish "gemlogs" using just standard gemtext with links that begin with an ISO-date to produce something like RSS but much simpler. And then there is the Antenna site that anyone can broadcast their gemlog updates to by just pasting the gemlog URL in a form (and also various other gemlog aggregators, but Antenna seems to be the most popular one?). Antenna would never scale the way it works now. Most things about Gemini probably would not scale. But there seems to be a low risk that it grows too much anyway.