We don't have that much need for "free" shipping on cheap Chinese products, and the convenience of the Amazon marketplace is now counter-balanced by the inconvenience of sorting out the fake goods and fake reviews. We are choosing sellers' own marketplaces when we can these days, and just dealing with longer and paid shipping.
Additionally, we are finding that Amazon Prime Video doesn't have so much that we want to watch anymore either, and we are paying for multiple streaming services anyway.