It's a more expensive AliExpress and has been that way for several years now, ever since the drop-shipping trend started.

Amazon is increasingly delegating its retail business to those sellers now, and making money by selling ads for premium positioning on search results, and of course taking a cut of each sale.

They treat retail like its an embarrassing legacy offering, something that they'd rather not still be doing. It's clear that they have shifted their focus to things like AWS, Prime, Ring.com and the like.