The reasons for that are pretty well established, IMO. Nostr doesn't generally provide the same addicting experience, there's very little to keep attention seeking whores around, and the current average nostrich is both too smart and too independent to put up with most influencer nonsense. (At least in my corner of the nostrverse.) I am an advocate for slow growth over pushing for exponential adoption, mostly because the current infra is utter trash and while there is good development going on, the worst thing to happen would be a million people overloading poorly equipped relays.