I watched it on shrooms when I was a teenager. From what I remember, it was pretty good as an art piece (atmospheric, cool visuals and audio).
Book is better for the plot/storytelling. IIRC the film was supposed to be a companion piece for the book.
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.