Bluesky is going to be successful because of its current state of being invite-only and sponsored by Dorsey. It's essentially the new blue checkmark: an indication that you're part of the group of "always-online Twitter powerusers". Once Bluesky opens up people will join because they either want to be part of that group or the people that you'd follow on pre-Elon Twitter are part of that group. Technology has little to do with it
Yep, since Twitter's UI is extremely easy to copy, all you need is the users and the culture. Granted that's usually the hardest part, but Elon is giving everyone tons of reasons to move away.
