in my opinion, i think Nostr has heavier concentration on development and lesser on user acquisition efforts in mind. The latter doesn't have to high expense or ads purchase related - at early stages its all about on segmenting users and narrow focus on reaching out to them. I think there are many missed opportunities on Nostr - lots of content (that is not bitcoin related) but its not a match to users who would have found it interesting. Also not always maximising content outputs.