Individual level action is insufficient to overpower network effects in the service of the public good of maintaining sovereignty. The desired outcome is just not connected to an individual's incentives to a strong enough degree. State action is needed.
Once again, I urge people to read Taleb before giving in to apathy:
https://medium.com/incerto/the-most-intolerant-wins-the-dict....
It would take only one high-profile European institution to drop Twitter and set up their own server on the Fediverse - e.g, The Spanish "La Liga" running their own server for all the clubs and players eligible to play in UEFA - to get a good amount of people rushing to find out how to set up their own account.
Looks like an interesting read, I'll finish it in a minute, but I just want to say, as someone working in a medium profile public institution...
Yeah our PR team would love this idea. What would actually happen is that nobody would read our updates, except that one or two journalists who repost it immediately on Twitter and X.
A "medium profile public institution" can not make their own gravity, like La Liga can.
For them, I'd recommend to take a POSSE [0] approach: create their own instance and treat the other platforms as mere syndication channels. This would allow them to not lose any of their reach, but would also signal to everyone else that an exit path is available.
[0]: https://indieweb.org/POSSE