The guidelines already cover this:

> Please don't use HN primarily for promotion. It's ok to post your own stuff part of the time, but the primary use of the site should be for curiosity.

https://news.ycombinator.com/newsguidelines.html

I assume that users who primarily/only post their own stuff and get flagged a lot reap the consequences, there's plenty of spam filtering on here thank goodness.

make interactions with others' posts/post others' stuff a soft req for posting your own stuff? So not following it could be deemed actionable by the hn mod team?

Edit: nvm thats already in the guidelines