This is a perfect example of the tradeoffs between openness and privacy.
If you give dangerous tools to users, you will have a few cool things and lots of tech-illiterate users screwed over.
Privacy advocates often preach solutions like the fediverse, without understanding that the fediverse is a privacy disaster for the tech illiterate. Cambridge Analytica wouldn't even be preventable on Mastodon, and it would have far worse consequences. Nevermind admins snooping on messages of their users, for i.e. romantic or financial reasons and poor people having to pay for their own services instead of seeing ads.
Yes, Facebook is horrible, but all currently known cures are worse than the disease.