"Respectable" media are beholden to their advertisers, who in turn are concerned that specific demographics might be scandalised by certain words and affect their bottom line. I don't think HN or much of the internet fits into this category.
Academic papers are an interesting case. I suspect their avoidance of the word fuck is a combination of their inherited sense of propriety and the fact that such an ambiguous word as "fuck" rarely has a place in scientific writing.
(Other than belaboring the point, an example of which I have just given)