Moderating like a public forum is easier said than done. Is labeling flat earthers as incorrect wrong? What about banning people spreading covid misinformation?

Moderating like a public forum is easier said than done. Is labeling flat earthers as incorrect wrong? What about banning people spreading covid misinformation? What if there are true american citizens pushing KGB / russian propaganda, they have every legal right to do so, but will Twitter still allow it? At what point does a policy like "respect peoples' free speech" end with the specific reviewer's moral compass determining if something is targeted hate speech or just satire?