Nazis will always exist. The question is whether moderation is good enough to keep them away. so far, in the most part, blueskys blocking feature has been good at collectively detracting them. But that could change (or maybe I am not active enough to know!).

A second difference is, in my opinion, Elon Musk is a nazi. The people who run Bluesky are not nazis. Antisemitism is rife on twitter and elon musk embraces it.