They figured out that this kind of feed makes the most money from the most users. They don't care if you like it, they care what the majority of users will stick around for. The longer total scrolling time they can get from their user base, the more ads they can cram in there. Ads make money.
Algorithm leads to more scroll time per person leads to more ads per user leads to more income
So, because money
Paying for Amazon Music and using Amazon Music are two different things.