There are specific rules for Show HN (https://news.ycombinator.com/showhn.html) and tips (https://news.ycombinator.com/item?id=22336638) from the HN moderation team, a couple of which are "Drop any language that sounds like marketing or sales. On HN, that is an instant turnoff. Use factual, direct language. Personal stories and technical details are great." and "Don't have your username be that of your company or project. It creates a feeling of using HN for promotion and of not really participating as a person. You don't have to use your real name, just something to indicate that you're here as a human, not a brand." It's pretty clear that using Show HNs to deliver sales pitches is not part of its intended purpose.