are you worried at all about being asked to blacklist certain npubs in the future? This is still platform censorship, although you cannot 'deplatform' from the protocol.
Discussion
I highly doubt apple would ask me to block specific npubs in my client.
if not apple, the canadian government, etc...
it's not 'impossible' to imagine. Say Damus captures 90% of nostr userbase in a few years. Platforms+companies can always be central points of failure, what's important is protocol level decentralization, the fact that users can always take their keys elsewhere, and the existance of alternatives.