I think this note could be the answer.. many devs looking for the same solution, started to built on the same protocol.
Probably the answer is in the specific tech of #nostr itself, since it's easy to work on it, really open source, with an almost infinite possiblity of connection and more network effects.
Probably it's the first protocol were anyone can built his social graph without risking to be deplatformed, since there is no platform, only connections.