The people leaving Twitter right now want Twitter minus Elon. That's Bluesky. They've heard a couple of their Twitter follows mention it and they've gone to their app store where they find an app called Bluesky, install it and easily join and start using it. Once they do they are finding it pretty straightforward to find people they used to follow on Twitter.
That's all people want.
The sort of error that only occurs when it might become bad PR.