It's like having a restaurant that serves 300 million people. You can try to offer every type of food there is, but most people may not like most of them. Which is fine, as long as you have something they like.
The same goes for food; there are things that are quite controversial, but who says no to fantastic ice cream or bread?
But most importantly for movies, it is not the micro-genre that decides. People who are not into fantasy or astrology still love Lord of the Rings or Interstellar because they are particularly highly produced, where all crafts making up that movie are treated highly instead of strategizing and optimizing.
For example, The Shawshank Redemption has very high rating on IMDB, but also many people have never seen it and are not interested in watching it.
It's also almost like we shouldn't have one restaurant serve 300m people. Aka a monopoly.it'll collapse overtime anyways, because of you're competing on slop you can't beat the social media model of a bunch of low cost addictive TikToks for "free". The race to the bottom was already won and ot doesn't cost $25/month.