This has already been mentioned a few times. Just find the relevant issue on GitHub and give it an upvote.

• The rank of a post in the aggregated feed should be inversely proportional to the size of the community #1026
• Weighted Community Subscription for Customized Feed #3518
• Balance Instance Scores Based on Monthly Active Users #3642

I knew I recognized him from somewhere. He was the developer of lib.reviews. https://github.com/eloquence

I’ve saved this, but it would be nice to see the syntax somewhere in the search engine