@malte @abekonge while I really like the approach of migrating whole networks at a time, I am a bit skeptical with the level of organizational overhead I imagine your concept requires.
I think people agitating to leave and eventually setting an ultimatum works, and what people do already.
Perhaps we can enshrine the day Twitter was sold to Musk as Exodus day, and agitate for it every year as a coordination point for switching?