Those spammers are ripping off their own customers. What actually happens when people use that service is that they get their sites and accounts banned. I can't claim this in all cases, because I don't have a list of all their customers, but we've done it dozens of times and we have much independent verification in the form of user confessions and mea culpas. (We're softies when it comes to forgiving people, by the way, as long as they tell the truth.)

As I said recently, it's a cat and mouse game and we eat a lot of mice. https://news.ycombinator.com/item?id=21916935

You guys should realize how much work we put into defending this site against manipulation. Especially if you ever find yourself wondering why there isn't much new feature development on HN.