If Amazon took the advice and paid higher, the products would cost more and the web-potificators would congratulate them profusely for their magnanimity while putting them straight out of business with their buying habits.
Amazon is huge so it distorts the picture and seems to muddle the thinking a bit but even the largest of ships are beached by a receding tide.
I'm not saying that this is the desired order of things, just things work at the moment.
Amazon needs the work done, people are willing to do that work for that wage under such conditions - supply and demand. At least people have that option; impose restrictions, and many go from having that option to not having it (while the employer finds cheaper options).
Here's the deal: How about you and me go into a big pit, with knives. And if I win, I get all your stuff.
Oh, I see, suddenly you'd rather get the State involved.