Since Amazon has clearly clobbered the bogeyman of honest reviews in exchange for a discount, maybe now they can DO something about the fraud that is co-mingling.
For those not up to speed, co-mingling takes place when various suppliers all certify they have x number of identical products and they ship these items to Amazon who then holds them for fulfillment. As far as Amazon is concerned, the items supplied by Larry are the same as those supplied by Sara so the items get pooled together and orders are filled by whichever one makes sense to Amazon.
The problem is, a LOT of vendors are faking it, certifying other products are the same or supplying counterfeit versions. Suppose you order a bottle of Coke. Larry and Sara both sell Coke on Amazon and both of them ship the bottles to Amazon and Amazon then fills the orders. But Sara hasn't supplied a REAL Coke, no she's sent in some store brand drink.
You order a Coke on Amazon from Larry's store. Amazon says well, we have 15 Cokes in stock, and Larry's are the same as Sara's so we'll send you one from Sara's supply since it's closer to you. Your Coke arrives and you spew it all over the place when it turns out to be store brand and not the real Coke. So you leave a bad review! Larry has shipped you fake coke and he's cheating! His reputation takes a pounding and he doesn't even know why.
Larry is then put in the spot of trying to make things right with you even though HIS Cokes were fine and it was Amazon who shipped you the fake one. Amazon does zero policing to validate products are what they say, so Sara gets away with it.
This sort of fraud is happening all the time now. Legit vendors are faced with bad reviews for fake products they didn't supply, but they have to turn around and make the customer happy or else Amazon penalizes them for negative reviews and bad feedback.
The fake suppliers don't care because they don't get caught very often and even if they do, they just toss the account and make a new one, and of course they never had legit merchandise to sell anyway so any sales that DO take place stand odds to be fulfilled with the real merchandise.
Amazon is doing nothing to fix this and thousands of honest vendors are being slammed with bad reviews about fake or counterfeit or dangerous products that got co-mingled into the system.