I think the lesson is that the impulse to imitate high-status people is very strong. Even when the behavior has no intrinsic value to the average Joe. If a social network gains a reputation for where SV entrepreneurs or "thought leaders" or Harvard heiresses hang out, then many people will flock to it regardless of what the actual experience is like. When Facebook opened up to a new campus, students would sign up en masse without even realizing what the product was.
[1]: https://twitter.com/default_friend/status/135961816878890598... [2]: https://twitter.com/default_friend/status/135961480306553651... [3]: https://www.eugenewei.com/blog/2019/2/19/status-as-a-service
Quora ended up being like if Yahoo Answers and LinkedIn had a baby. I expect Clubhouse to go in a similar direction.