Yeah, mastodon definitely needs a better algorithm. Algorithms can be designed to promote whatever the maker wants. It doesn’t have to be designed to maximize engagement or the specific kind of engagement that tends to promote crazy conspiracy theories or fascist rhetoric. The algorithm could just be simple collaborative filtering with some randomness thrown in to pop “information bubbles,” which would be much better than what they have now.
Linus Tech Tips reviewed one that came with a little radio tower it used for position (guessing it used a combination of many sensors). Seemed to work OK in his flat little backyard.