I think this is the difference between Google and Apple. Google optimizes search algorithms constantly, apparently not thinking of the real-world repercussions

I think this is the difference between Google and Apple. Google optimizes search algorithms constantly, apparently not thinking of the real-world repercussions of rank changes. Apple has over a decade of experience with iTunes. Rankings on iTunes are equivalent to or even supplant the Billboard Top #100. When they moved into apps, they brought their ranking system over as well. Apple has only very carefully made adjustments to app rankings. Especially keyword based rankings. The secret of making money in the App Store is in dominating the ranking for a common keyword search. Pretty icons go a long way towards that. And a well-designed app even more (number of ratings, average rating). The Power Law distribution applies. I have no idea why Google is tweaking or breaking their core ranking algorithms. In the Apple App Store, a high ranking is something you earn through marketing and having a product that Apple wants to have in its store.