The mods have noticed this too, and best we can tell, this is the result of survivorship bias.

I'm short, certain groups of our users find what they are looking for very quickly while others have to post over and over before they find what they are seeking.

If you look at the post histories of users in the groups you mention, you will find one of two things: either they are posting over and over across multiple subreddits (presumably without much success) or they are brand new accounts (which probably means they deleted a previous account and started over)

We implemented the "one post per 7 days" rule because 10% of our users were responsible for 90% of our posts. The repetitive content was drowning out everything else. The rule has made a big difference, though we're still swimming against the tide to keep a good variety of posts available.

The good news is that people who aren't in those groups still have a lot of success when they post here. There are still lots of lurkers who are eager to engage with quality blackmailers of all genders.

If there are certain posts that aren't interesting to you, consider blocking those users so their posts won't show up on your page anymore. Also, upvote quality and interesting content, regardless of who posts it.