For 10 years as of a couple of days ago.

I think a part for the lack of adoption is that people want to be alienated from their service providers. One of the greatest joys of being on Reddit was complaining about the admin and there was plenty to complain about. Doing the same on fedi would feel pretty unkind. And some rando being the controller of your data rather than an anonymous corporation took some getting used to as well.

And some of the evil shit is unfortunately also useful. Do I want Meta to gangstalk me? No. Is it useful that they connect me with everyone I know? Usually yes.