Nice article, but too much focus on federation as a potential solution. The problem with federated networks ("Fediverse"?) like Mastodon and Matrix is that you

Nice article, but too much focus on federation as a potential solution. The problem with federated networks ("Fediverse"?) like Mastodon and Matrix is that you still rely on a (sub)domain and someone running a server. That someone could be yourself, but that's just an option for a small minority. That domain could be shut down. Nostr may solve this: instead of usernames the user has a private/public key. And instead of relying on a specific server your data can flow through many servers (relays).