I don't think this is ever going to work in practice because there is a significant incentives misalignment. The people moving to other platforms are doing so because the tech giants are trying to stamp out free speech. Someone who uses the platform for anything other than political speech has little reason to jump platforms to something that has significantly fewer people and an underdeveloped interface. You're guaranteed to create echo chambers of only the speech you sought to expunge.

More importantly, we should all revisit the world politic of exactly 10 years ago, where the biggest story was the Arab Spring--anti-government protests in the middle east. At the time, social media was heralded as a major factor in spurring the protests, despite tens of thousands eventually dying in the conflict. Governments were condemned for blocking access to the sites and many free-speech advocates attempted to develop work-arounds. Social media enabled the self-determination of the people in the middle east, something we should all care about.

Regardless of how people feel about the capitol riots, the war on free speech from silicon valley should scare the shit out of all of us. They are setting the precedent now for curbing any revolution in the future. The idea that "healthy communities" are the target really depends on who's doing the diagnosis.