I have ~280 followers on the Instagram with reasonable engagement on my photos[1] and -maybe- 10 on the Fediverse with basically zero engagement.
People won't stop using the proprietary apps until there's a decent amount of the people they know on the alternatives (which, to be fair, is definitely burgeoning this week.)
[1] A fair few from a hashtag which, correct me if I'm wrong, don't really work the same way on the Fediverse - you can't just follow #donkeys and get an aggregation of posts with that hashtag; only the ones from a particular server.
me: have you ever tried X? it's an alternative for Y
them: isn't that for racists or drug dealers or something?
Sometimes though, it's true. I remember experimenting with Freenet a long time ago and discovering it was being heavily used for CSAM. I've never uninstalled something so fast.
Normal people take such a beating, and just keep on trucking. It's truly fascinating.