The most interesting part of the HN discussion is not about the definition of what Amazon is doing, but the occasional misunderstanding of how large brick and mortar retail businesses operate at scale (see: buying shelf space/payment dependant on sales/etc). There are lots of folks on here that understand what Amazon is doing, less who understand retail businesses mechanisms. I'm not sure what Amazon is doing is lega…
Amazon told 3rd party sellers it wouldn't use their sales data for its own sales (and possibly contractually agreed not to? - unsure here), and it now seems that they broke this promise.
How other stores operate doesn't matter. Amazon said it wouldn't do this and used that trust to attract sellers and grow their platform.