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 Normans were Vikings - the then Frankish King, Charles, gave them land in north France if they agreed to shut the fuck up and stop murdering everyone in sight. They become known as 'Northmen' which contracted to 'Norsemen' which contracted to 'Norman'.