Same with Netflix, in my experience they truly know what I will like to watch, they seem to know what shows I'll love and what shows I won't love but will help pass the time, and seem to show it to me just when I want it.
I imagine it takes a lot of time and lots of past history and data on users to create those algorithms so when starting out the human curation method is required. And for companies like Apple, may be the long term strategy because the alogrithm method that YouTube and Spotify comes at the cost of potential tracking and privacy concerns.