None of this could happen with a protocol. You cannot require age
verification on IRC, XMPP, ActivityPub, Nostr, or Matrix, because there is no
single entity to compel. Each server operator makes their own decisions. A
government would need to individually pressure thousands of independent
operators across dozens of jurisdictions, which is a legislative and
enforcement impossibility. And even if one server complied, users would
simply move to another.
This is wishful thinking. A government would just move to the next layer of the stack and attack the supporting infrastructure, like DNS, payment services or datacenters. To the degree that a protocol is a manner of communication between things (fka services), those things can be made to comply with the prevailing legal authority.
alt Hacker News
The interesting thing about Nostr (vs each of the other options listed here) is that it works perfectly fine over sneakernet. And that has been impossible to block throughout the world, even in some of the most oppressive nations.
Since the spec includes identity, content (in multiple formats), and authenticity/integrity, this makes it superior to nearly all alternatives for offline use. Once you know someone’s key, you can verify that content comes from them, however you manage to obtain that content.