In the case of blink-dev, yeah moderators like me. But AFAIK we didn't block any replies there at all because nobody in that forum was making threats or anything like that. I also haven't seen much of anything on these HN threads which I'd say violates the code of conduct we use on the chromium forums.
Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith.
Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something.
Please don't comment on whether someone read an article. "Did you even read the article? It mentions that" can be shortened to "The article mentions that".