Only ones I’ve run into so far are working on other social projects or protocols, and they’re pissed theirs didn’t take off.
Discussion
I think they probably didn't realize yet that they can build whatever they were already building, but use nostr under the hood and 1000x their user base.
Oh no, they've been polishing their baby for years and years now. All behind the scenes, and they're not ready to release it yet, but snarky about everyone using other technologies and just fucking shipping.