Nothing, which is okay. People make the mistake of thinking users have any even passing interested in a good platform with social media, not just the social connections on it.
That is why Bluesky can be so successful: It’s an absolutely smooth and effortless drop-in replacement for Twitter, and has no gathered enough momentum for it to be easy to find existing people you want to follow on it, further drawing more people who you might want to follow in. So the motivation to use it is there, and the switch itself is essentially unnoticable.
Extra weird because this is always the narrative, yet Trump could be any further from “standing up for the little guys” if he tried. It’s the same with the AfD in Germany, their voted policies (which is public as per the EU regulations) are as anti-consumer pro-corpo as you can be, even edging our truly crazy libertarian money sucker positions.