How about open source pluggable algos which can be optionally marked shareable between users and selected from a list sortable by number of "installs"

So like a user could define an algorithm to select posts, and then mark it shared, and other users could see it in a directory and try it out themselves, and optionally clone and hack on it, release a new version, etc.

As far as how the post selection algos could be defined, I'm thinking of something similar to the boolean query syntax in the Quod Libet music player, but one could also implement a more code-like syntax.

(I'm aware this is a huge ask, but I've had this idea for 8 years since my first Mastodon account, and have been too busy being oppressed by life to do anything about it.)