> Public keys aren't likely to be blocked
They will be.
> Content will be blocked, mostly.
That is not how censorship-happy people operate. They want you cancelled from all forms of speech, even life.
> If a government or public campaign against a person results in a public key block, it only requires one relay and some other communication mechanism, outside Nostr, to get the word out
Nostr Relay amins are looking at blocking IP's now of 'bad actors". What good is adding a relay when nobody will be able to see it? Add a million relays, go ahead, barely anyone will know of it and want to interact with it because they will get cancelled