The problem is for organizations it’s harder to leave because that is where the people you want to reach are. That’s the only reason any org or company is on social media in the first place. If they leave too soon they risk too many people not seeing the things they send out to the community.
It’s more an individual thing because so many people just have social inertia and haven’t left since everyone they know is already there. The first to leave have to decide if they want to juggle using another platform to keep connections or cut off connections by abandoning the established platform.
As a queer person I don’t really care at this point if China or Russia is tracking me. They aren’t the ones who are currently stripping me and others of rights and so many other things.
I don’t trust any governments on this front, but the government I live under is way more of a concern.