Bluesky won over Mastodon because the fedi model is fundamentally flawed in its UX. For a flood of people wamting "Twitter without Nazis", Bluesky was a good match. I don't think Dorsey had anything to do with it, because the influx happened after he'd already severed all ties.
Some people are getting introduced to similar and in some ways worse UX on Bluesky now that there are some actual efforts to make it slightly less centralized.