Actually, there is a lot of weak evidence out there that de-platforming actually worked as intended. It did push some users to more radical spaces, but it also made it very difficult for weakly-interested users to be pushed into the space and become further radicalized. When 'the algorithm' can no longer suggest a slightly more radical version of the content you are currently viewing because that version has been de-platformed then it seems we start to see the norm drift back towards center rather than being pushed further to an extreme.