Yes, so the ease of the whole onboarding process & communities/groups that migrated there.
No arguments on the first one (tho stupid on both sides).
What my brainhole is telling me is that the second argument feels a tad too big seeing how Mastodon basically didn’t grew in the same timeframe. What they call “content” and “community” creation feels driven, the “wave” as you put it.
(But again, this is just imho & ‘a feeling’, I have no sauce, not even that much personal experience)
You don’t promote good workers, the job description changes with promotion so the previously good worker might not be (as) good anymore.
Good workers with lots of expertise and know-how get more work.