The remedy in this scenario is to simply not buy Amazon fridges, not have the government step in and force Amazon to change its fridges. Legal intervention should not occur unless Amazon was the only fridge seller in the world.
Would you please stop posting in the flamewar style? We've had to ask you many times. The snark here is not cool, and you've crossed into personal attack and did it again in https://news.ycombinator.com/item?id=24313573. We ban accounts that do these things. If you wouldn't mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the intended spirit of the site more to heart, we'd appreciate it.
You've added a number of details to this hypothetical scenario that weren't actually in the original scenario I was replying to. Let me go ahead and agree with you that if two companies have colluded to fix prices, then regardless of how big they are the government should indeed intervene.