One example of scam behavior:
Amazon, for sure, is well aware of bogus product reviews, and does nothing to fix them. The most galling: hundreds of reviews for products not related to the item.
It's okay to have cheap junk, but not okay to fraudulently pretend it's high quality.
I think, though I have no way to prove it, that the "Amazon's Choice" is also a "scam"-like moniker. In many of the electronic products I come across, it is often a poorly reviewed product compared to many other options, making me think it is the one that Amazon profits from the most.