[untog]

"thrives" != "exists"

I don't see a contradiction between allowing hateful content to exist but not actively promoting it to users. Time and time again we've seen algorithmic feeds that are entirely dedicated to making users click on more things serve up more and more hateful content (think: YouTube's recommended videos).

As I interpret it, the OP is calling for a return to neutrality on the open web, not censorship. No-one uses YouTube because they're enthusiastic about the recommended content that appears after their video. They use it because the potential audience is huge, and in many ways it's the only choice if you want to start a successful video career. The linked post is asking what if people had a choice?

Take Twitter for example. There was a mild uproar a while back because they started banning alt-right accounts. Those banned users then set up Gab (I think?), a Twitter alternative for the alt-right. In an open world where dozens of different social networks exist this wouldn't be an issue at all, in fact it would be how things should work. Anyone can make their own playground, and anyone can decide their own rules. But the closed, centralised world we have today gives companies like Twitter far too much power, and far too broad an audience to effectively use that power.