There was an interesting article in Business Week this week. Amazon has had problems with China based sellers using fake reviews, and other actions, to boost the rating of themselves and their products. There are companies in China that provide what's called a "brushing service" to boost the rating of a seller and their products. Amazon terminated more than 50,000 Chinese sellers from the marketplace for these actions in 2021.
According to the article, many of the sellers have gone to the Walmart Internet marketplace because Walmart does not police their site as well as Amazon. Walmart offers the sellers the ability to stock their items in a Walmart warehouse so it is not obvious that the seller is from China.
Bloomberg has a paywall but you can usually get a couple of articles free. The title of the article is "Amazon's China Castoffs Turn to Walmart". If you're interested in reading more, search on that and see if you can read it on Bloomberg. I found it very interesting.
Mike