[tarsinge]

I agree that mixing cash flow and profits is confusing. But that doesn't change the point: not turning a profit means you lose money on every sale (which was not the case of Amazon, the profits were just small compared to the sales volume), it's by definition unsustainable unless there is a very strong plan mid-term (like not "self-driving cars" for example). The question is legitimate, though the word "allow" is maybe not the best choice.