I think a lot of things that are proposed here could not be done by an AGI on an computer, no matter how intelligent. Consider this alternative scenario: You have an exceptionally intelligent young human adult with a computer locked in a room. They have no specialized education or anything. They are just extremely intelligent. What could you achieve through such a person?

Discovery of new physics is out of the question. That would need experiments.

I think that is threads.net, no?

Copyleft should absolutely work. Not sure what we are currently doing, but nearly every toot or reply in the fediverse is copyrighted content. You must explicitly or implicitly give a license to every instance to use and redistribute that content. I could imagine a field in ActivityPub that declares the license, for example using Creative Commons licenses. If this license forbids commercial use, Meta can’t use it. Also nobody else, such as journalists? Probably needs more thought on how a license should work. It is definitely a sharp sword!