From reddit (/r/fediverse), I found this might interest people here:
It go on basic discussion of the Fediverse, Gab, but also what happened when India users started to join in drove.
In the end, the secret seems to be to keep things small (higher moderators/users ration, similar to
run your own social), and provides good moderation tools, and this should be taken in account in the UX design (the video call out Peertube for not doing that, and I remember people complaining before 1.0 at that time).