It's not third party sellers, it's comingling inventory from third party sellers. That breaks the reviews / reputation as a way to check, and it means if there's even one bad egg, even if I buy from Amazon itself, I can still get the wrong product.

Selling fake products masquerading as a real ones. That’s literally the worst case scenario for a customer.

If I buy a product and it has issues—okay, it happens. Maybe I post a bad review or just don’t buy it again.

If I buy a product and it’s something else, the seller should be ashamed of themselves.

I have bought (and returned) countless fraudulent books from Amazon to the point where I had to weigh the books, count the pages, and compare with publishers.

And then I closed my prime membership and I’ll take the longer wait times for a real product.

It seems to me Amazon's comingling is bad for competition. Players on their platform, not between Amazon and others.

Have any of the regulators taken note?

I've been reading Congress' anti-trust research and reports. Haven't seen this called out yet.

Legal thinking shifted towards a price focused for all things antitrust. You can be a monopolist, as long as you don’t quickly raise prices. That’s why 3 companies control 90% of meat packing.

Companies like Amazon are carefully engineered to avoid that type of enforcement action. Nothing will happen until you have a major political shift - I’d guess somewhere around 2035-2045 when demographics shift the political dynamic in the US.

I usually filter by "Retailer: Walmart.com" for any common and/or name-brand item (and price/shipping is usually better than 3rd part sellers anyway). You still have to take your chances for more obscure items, but at least for me that's rare.