Kiwifarms has a policy against illegal behavior (which would include some harassment and swatting). I am not sure if doxing is illegal?

Policies don't mean anything when a huge amount of it stays up and the platform does nothing about it.

There are posts literally and explicitly calling for people to murder others on Twitter. The posts have been there for multiple years (at least the last time I checked). Twitter and the other big players completely fail at content moderation.