Savvy individuals could manage it themselves, by creating their own servers and encrypting the traffic and only granting access to trusted individuals. Most people, though, would have a hard time navigating that. A centralized (or perhaps semi-centralized, a la Mastodon) could help a lot on that front.
Perhaps something comparable to Google+'s Circles concept. I always thought that was a great idea which was unfortunately rendered completely unworkable by the unfortunate accident that it was implemented by Google.
You’re forgetting that they also currently monitor everything everyone is reading, not just writing.
Until they are aware of this.
I still have to personally hold onto the belief that no one mind is ever intrisincally more strong than any other mind. That's the belief assumed to be axiomatic and foundational for all the studying of minds people do.
If I can predict how I believe you will think, I assume I'm mentally stronger, but that stuff is not something anyone can hold onto as a certainty. At least that's my belief, my own faith, my own boundary I believe in that must not be violated. Trying to intentionally control how people think is extremely violent, to me. Just because it doesn't look violent, doesn't mean it's not.
Spyware monitoring my browsing habits, down to the real-time location of my mouse pointer, is not something I want to be exfiltrated from my computer and correlated into a political or commercial profile.