real censorship? that is not a thing.

How would it be obvious to a normal person? Twitter censorship is rampant but not obvious to the average Twitter user. By the time that regulators get around to ordering compliance it is too late. You will be forced to censor if you make a censorable system.

it would not be obvious unless they had access to nostr notes directly from relays (on another client, as you say). their Primal-only world would not have that information, so they wouldn't know they were missing it. as i said at the outset, they'd be trusting, not verfying. but their ability to verify is restored with a little toggle that says "bypass caching server". EZ, if you want it.