Alternative theory: it's amusing to the people who find it amusing.

Those aren't necessarily the people who are building the reviled types of websites.

Very much disagree. It's written for developers, and I've never met any developer who finds profanity offensive.

And, more importantly, it makes the whole thing much more eye-catching. It's a fun way to a deliver a message - as a vitriolic, spit-flying rant. It would be ineffective if it was friendly and delicate.

I'm a developer and I dislike work environment where swear words are uttered every 10 seconds. Dunno about US, but here in Slovakia swear words are used mostly by teenagers and uneducated people with lousy jobs.

Well, you wouldn't see a rant like this in an actual work environment in the US; that would be wildly inappropriate. But I think most developers are completely okay with this in reading material, once in a while. They certainly wouldn't be offended by it, in the sense of it having a strong emotional effect.

Depending on the company, swearing might not be tolerated at all. At my company it's fairly common, but I only do it when in meetings with people I'm fairly comfortable around (my team, my manager, people I commonly work with).

Clearly you have never worked in the trading industry ;)

I'm a dev in the US, I really dislike profanity (especially in excess), and in most work settings, it's completely not-OK. I'm not saying it should be "friendly and delicate", just not gratuitously shoving in profanity every other word.