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I am thinking that the unintended consequences of sites like this one could quickly turn high profit products into low profit products for sellers. They perhaps will benefit consumers rather than necessarily benefiting sellers to any great extent.
The rise in private label products adds to this - if one seller can do private label and get good sales then a couple of dozen more can do the same. Without the good sales bit.
Usually blaming the platform (which has the new private label product low in search results) and other sellers (who jumped on the bandwagon) rather than themselves.