Show HNs have been getting slammed/spammed with low-effort projects, often from new accounts, often more about trying to do marketing than engage with the community. Because of that, there was definitely discussion of putting some limits on who can post them. I have no direct knowledge of what change they may have put in, but from your description, it looks like they went ahead and added some limits.

If you think you have got a valid complaint, you shouldn't submit it here. You should instead contact hn@ycombinator.com, as seen in the footer below.

But "Show HN" has seen its use restricted for new accounts because of the large influx of spam on the site lately. So you probably can't do much.

Consider reading the guidelines: https://news.ycombinator.com/newsguidelines.html

man what, ask hn got submitted and can't submit "Show HN" !! :(