Amazon is not a monolith. When you order from them, most of the product actually comes from different suppliers who themselves make use of the listing system and, in many cases, the distribution chain that Amazon supplies. For the latter, the item will say something like "Sold by XYZ and fulfilled by Amazon.
That is the reason that any review you post is referenced to the supplier itself, not Amazon, unless your item is one that is identified as being an actual Amazon item.
That is the reason that any review you post is referenced to the supplier itself, not Amazon, unless your item is one that is identified as being an actual Amazon item.