I imagine one reason Amazon is getting a lot of heat is because its stock is appreciating, Bezos is by far the world's wealthiest man and it's easy to claim that he and his fellow shareholders are getting rich of the backs of the workers. Walmart has gotten a lot of criticism over the years for the same reason. The fact that both retailers have a ton of workers also means there are plenty of hard luck stories to tell. In Amazon's case I know of at least one rather interesting book (Nomadland) to come out of stories about the camper communities that spring up around Amazon fulfillment centers.