Because then it wouldn’t be “all” any more.
You could do something like that, where instance admins choose what they believe is more relevant, but then it would be better to call it “featured” or “curated”…
Sub.rehab is super outdated and https://fediverser.network/ is easier and crowdsourced.
We still don’t need ATProto for that. ActivityPods solves that.
ActivityPub itself is built around the principle that the server owns your identity: the best you can do is abandon an identity (i.e, your actor URL) and tell everyone else (via the Move
Activity) that you are adopting a new identity.
And they are either in for one of the following:
Can we get a list of people that are on the Fediverse and you’d like to support?