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Yes, all of those things are possible. Now imagine a protocol built from the ground up for those purposes, not just possible, but the entire community and ecosystem embracing those things.

you mean http?

We've tried that, multiple times. Semantic Web, "everyone has an API" and more before and after, none of them gain sufficient traction to stick around and be built on top of.

> Anyone can build an app that aggregates from everyone's data.

Unless they gut or disable their API, and then ban scrapers, although I understand why after seeing bots crush sites.

Who are “they” here? Hosting providers? Hosting is app-agnostic and you can run it yourself.

Except it is intentionally unstructured. AT proto is one way to add the structures we obviously care about for "social" internet media on top of the freedom that the web as a whole provides.