If you mean the rule at the top, it's not up there to prevent comments like this, but rather the complaints that people sometimes post about their previous opinions/experiences with a company in reply to a job posting. We don't allow those because we don't have any way of knowing which are justified and which aren't. Bad corporate behavior is a thing, disgruntled commenters are a thing (the kind who are good at telling only one misleading side of the story), and the two can be hard to tell apart. Sometimes the community can sort things out through the informal adjudication process that arises in HN threads around controversial questions—but those are lengthy and Who Is Hiring threads are not the place for it.