Comment by gabordemooij

4chan hardly moderates. If Twitter wants to cater to people that want some kind of filtering just allow those people to enable a filter. Problem solved.

A platform should not moderate at all. Only remove clearly illegal stuff. For the rest, offer filters for people that want to have them (or better, design a protocol: <content-label type="trump">) so it can be built into browsers.

That way you can have both: free speech and optional filtering. And you can be a platform instead of a publisher.

(edit: I added some elaboration on a possible solution )