Earlier quoted context omitted.
> Free market research with the data from your paying sellers, to then enter a market with a product you know will sell, in a position of dominance. But these are the things that are pro-competitive. So now they make batteries. They're not putting Energizer out of business, they can still sell through Walmart or local convenience stores etc., and some customers still buy Energizer batteries on Amazon, but now custome…
You described a perfect market scenario, where all players start on common ground and compete between them. Now imagine you have access to all the data from your competitors. Sales numbers, A/B testing on images and descriptions, keywords, etc. It might be good for customers, but it sure isn't ethical and I personally see it as being monopolistic in a way, as in "I'm copying you with your data and you know it, but ca…
Moreover, what should businesses use to determine whether to enter a market or how to price their offerings? A dart board doesn't make for an efficient market. It sounds like you're objecting to someone other than the incumbents having access to the threshold amount of data needed to know whether it's worth entering their market.
If the existing competitors were already charging thin margins in a highly competitive market then Amazon could look at the data all they want but their conclusion would be that it makes no sense to enter that market. When that isn't the case, the "victims" of this practice are some other abusive conglomerates with sour grapes.