Given the margins it might be that the only reason they're cheaper is they any discount from selling it under a store brand isn't reversed by having to pay prof

Given the margins it might be that the only reason they're cheaper is they any discount from selling it under a store brand isn't reversed by having to pay profits to a pointless middleman. I don't see a problem with them selling their own banded stuff, or even if it's cheaper, in most senses. I do see a big problem with using what most people consider to be an open market that you can get anything on (even whole computers!) and specifically using that power to inhibit competition by having different advertising policies. It's not like those products were pulling an epic and refusing to give Amazon a cut of the sale, or doing something illegal -- just being banned from visibility is ridiculous abuse of monopoly power.