This answer has a link with a referral code in it (with a disclaimer, though). It doesn't answer the question as much as it glorifies the service it links to (which I believe is borderline illegal in the US, but that's irrelevant to this question).
How should this be treated? I consider this spam - the writer has clearly no interest in answering the question, and just uses the opportunity to get more referrals. But the OP seems to have liked this and accepted the answer (I added my later).