What if instead of opting _out_ of content and #federation (fediblock), instances had to opt _in_ to content and federation?
What I mean by that:
* Instead of "things appear in the federated timeline by default" it is "only servers that have been reviewed show up in the fedderated timeline."
* Instead of "follow requests require review if coming from a silenced server" it would be "non-mutual follow requests require review unless coming from a reviewed server."
