I think you (and the Nostr people as well) are just muddling terms here. Censorship is about an external 3rd party (usually the Government) preventing you from seeing things you are potentially interested in, not (as in the case of Lemmy) your service provider and their trusted moderators helping you curate your social media experience. If you are unhappy with the moderation you can easily switch to another instance and use other communities.
I disagree, and Gmail and Facebook do engage in censorship by hiding stuff the advertisers that pay for it don’t want you to see or be themselves associated with. That’s not even close to what moderation is and confusing the two things as “just two perspectives” is not helpful at all, as you end up justifying censorship through that.