Many people who've tried it found it didn't work properly - that might be getting better now for people trying it now, I'm not sure. 

Aside from the shit actually working, you then need algorithms that help get people started with finding engaging posts and getting engagement on their own posts. None of the nostr apps seem great at this yet. Some apps like iris, satellite, and primal are starting to get good at curating feeds but helping beginners get engagement is still not up to par with centralized bullshit like Bluesky (where one of the most popular feeds just contains all first-time posts by new users, less effective on nostr where anyone can make a throwaway npub)