Regarding #2 and the affiliate/associates program: Without going into specifics this is generally prevented. For example, pages viewed from iframes include referrer headers and most web browsers will report screen dimensions, etc. You can tell when content was loaded in the background and doesn't match with the subsequent purchase behavior.
Amazon is insanely customer-focused and works hard to ensure everything is fair and above board.
If Amazon pays a percentage to some website I visited that's really invisible to the customer. Amazon's incentive here is their Karen Carpenter thin margins (too soon? too bad, I'm tired of using razors as the cliche thin metaphor).
Besides your sentense not making a lot of sense (i.e. I have no idea what you are talking about), no one knows what a Karen Carpenter is - some kind of woodworking tool? (I suppose I could google it.)
Amazon is insanely customer-focused and works hard to ensure everything is fair and above board.