Yes and no. Companies are "greater than sum of its parts" beings. Trading with "Roy's Used Camera Gear" sole proprietorship is essentially dealing with Roy himself. I'd say morality and basic human decency strongly applies on both sides here. A megacorporation of Amazon size? There you're dealing with an amoral artificial intelligence that uses humans as brain cells and bureaucracy as brain activity. This being does not follow any moral principles, and will happily screw you over whenever it's profitable for them.
Humans are involved in every activity of a corporation the way our neurons are involved in thinking; you don't say that neuron #24262934 is stupid because all it keeps thinking about is kitties. That neuron only conveys signals, and the thought originates and evolves across many of them. This also implies one is not absolved from moral responsibility to individual agents of a corporation. It's not the fault of a sales representative or a helpdesk clerk that the corporation made decisions that hurt you, much like it's not a single neuron's fault that your brain keeps thinking about cats.
Same thing in other words: a market entity seems to have two aspects - the human aspect, and the "emergent" aspect that's manifestation of market pressures incentivizing members of that entity. The human aspect is in scope of moral considerations, the market-emergent aspect isn't. As a company grows in size, the human aspect diminishes while the market aspect takes over.
(Note that this is a perspective I'm currently entertaining, but I haven't thought it through as thoroughly as I'd like. It seems to be a correct intuition, but it may have inconsistencies that I haven't realized yet.)
The size of Amazon is such that they can afford to bleed heavily from selling mid range pro camera equipment at a significant loss whilst recouping the profit from all the incidental purchases and traffic that the attention brought.
I'm not saying that this is what happened, but marketing budgets run into the millions (especially for a highly promoted yearly event like Prime Day) and dropping a few hundred thousand on a scheme like this isn't so outrageous.