I have to disagree a little.
You might be right simply that no one actual cares about any of this, and 99% of people don't care at all who gets banned or censored and who doesn't. And they'd all just stick around to the one place where everyone else is and that's that.
But this is an argument against the idea that people care or don't.
Assuming people do care, then Bluesky is the first protocol attempt that could actually work, because it lets you move your existing account freely to any alternatives easily, and because it also allows you to control your own recommendation algorithms.
If people don't care, than, people don't care, and that's that.
But if people do care, you need to achieve the above behavior, and that becomes a technical challenge that tech can solve.