Yes, they do; they just aren't generally available on open terms.
Well then I come back to my original point: H&FJ is an unfortunate example to compare with open fonts, because they have already excluded themselves from the markets we are talking about in this HN discussion.
If I'd seen it and commented on it, your comment would make more sense.
Your previous statement "[Open Sans is] a competently executed font that will make you look like you care about as much about flashy typesetting as Google does" came across as a not very subtle insult, as if anyone using Open Sans can't typeset anything more interesting with it than a big white space with a couple of words and a text box in the middle. If that wasn't what you intended then I withdraw my comment.