All due respect: if an employer posts here offering for people to apply, that the employer in question is bad in some way, I don't see why that's considered "off topic." If a company sucks, we owe it to our fellow engineers to get the word out until they improve. A perfect example being the sorts that don't have any intention of filling the jobs they post.
In my mind the only sort of company that would avoid posting here due to the potential of being criticized by the HN userbase are exactly the sorts you don't want posting, so that seems like a win/win.
Just my 0.02.