I guess the problem with those platforms is that most privately censored speech is still the actual hate speech stuff like Nazism/racism/homophobia/etc, so those platforms have taken on all of those aspects because those people have nowhere else to go.
But Twitter is not already a cesspool of those things, and I guess the feeling is that loosening up on the reigns a little bit won't suddenly cause Twitter to turn into a neo-nazi dominated platform. You'll just have things like not banning Donald Trump or not squashing factually correct NYPost articles – which of course are things that you can still debate the merits of but are different from Twitter becoming 4chan.
But Twitter is not already a cesspool of those things, and I guess the feeling is that loosening up on the reigns a little bit won't suddenly cause Twitter to turn into a neo-nazi dominated platform. You'll just have things like not banning Donald Trump or not squashing factually correct NYPost articles – which of course are things that you can still debate the merits of but are different from Twitter becoming 4chan.