Keep in mind that the recommendations are likely influenced by being in the top 200, which is where they look for games to review. Careful of correlation fallacy
At the same time, the goal of dark patterns to to make people spend more money. Given that revenue is very likely one of the key things Google wants (and thus promotes) out of apps, its also entirely expected that the apps people find are largely those who try and get the most money from users, which requires dark patterns.
Exactly. I'm not blaming Google entirely, though I do condemn them for being an example of what emerges from a system who's only incentive is maximum profit.