Your complaint seems to have two main components: (1) that the startups exist at all, and (2) that they were posted to HN. While you may be right about the quality of the ideas, I definitely want people to continue to post any and all startups for review on HN. Both great and horrible ideas tend to lead to intelligent, informative back-and-forth in the comments from which I feel like a learn quite a bit even as just a lurker.