What we are learning is that making it trivially easy to amplify anyone’s message enables cancel culture and (I believe) leads to radicalization.
If this is correct, then increasing amplification friction on your platform will lead to less radicalization, at the cost of lowering engagement. My guess is that for this to be successful requires a careful balance of where you land on the higher/lower friction spectrum. Too much friction leads to low engagement which leads to failure. Too little friction leads to uncontrolled amplification which leads to radicalization. So a balance is needed.
Either that, or a totally new idea is needed that turns existing platforms on their head.