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 But they have to pay to attack.  
 And you think nation states won't do that? 
 It's the same game theory as Bitcoin. Attacking it means paying the people that run the things... It's a futile effort. There are much easier things nation states can do to target specific relays. Again, it doesn't effect nostr if one relay goes down what's.  
 As you said that I was wondering whether the #GFC admins have figured out how to block #nostr  #relays by protocol behavior as they've done with #signal.  

From what I've read it depends how simple the protocol is. #xmpp  is hard to block even for China because it's so simple, but most others are a done deal already. 
 nostr is extremely simple. It's all just json being passed around websockets 
 but it's encrypted from client to relay. 
 Not always but I don't think that matters