https://slate.com/technology/2022/09/kiwi-farms-cloudlfare-a...
The point is that if you're using your speech to silence people, not by disproving their arguments but through terror and the destruction of their reputation and social network, when you silence people by lying about them, your speech is a threat to free speech.
By protecting sites whose purpose is to silence particular individuals through lies and threats you are reducing free speech. This is a case where you have to choose which speech to protect. They are in conflict. And the site you might defend is not the one making a good faith use of the freedom you wish to protect.