While anyone who invests money and gets nothing in return has my sympathy, I don't see the relevance of a private business transaction to HN.
You will sometimes find someone plastering notices all over the city. These notices have a picture of someone and the warning not to date them because they are a lying, cheating low-life. Is this a public service intended to save other people from an unhappy fate? Or is it someone trying to get revenge by naming, blaming, and shaming someone else?
Unless the "scamming" in question is happening on HN, such as someone spamming HN with fraudulent posts, I have trouble thinking this kind of thing meets the HN guidelines.