This is an interesting article that's worth discussing.
From my understanding, there's no specific rule about anything like that. "Show HN is for something you've made that other people can play with. HN users can try it out, give you feedback, and ask questions in the thread." [0] Generally people on here care only if there is an issue about a conflict of interest in some way. I am sure there are rules about spamming but flagging usually takes care of that situation.
Self-promotion is permitted, but should be within reason.
There are accounts which submit only their own content, and that frequently. These tend to get marked as spam, the sites blocked, and often the profiles are banned.
If you submit a mix of sources, including occasionally your own, you should be fine.
From my understanding, there's no specific rule about anything like that. "Show HN is for something you've made that other people can play with. HN users can try it out, give you feedback, and ask questions in the thread." [0] Generally people on here care only if there is an issue about a conflict of interest in some way. I am sure there are rules about spamming but flagging usually takes care of that situation.
https://news.ycombinator.com/showhn.html