Look at the cash flows from operations. This is a big indicator of whether the core business is profitable. I have not looked at Amazon, but non-cash write-off

Look at the cash flows from operations. This is a big indicator of whether the core business is profitable. I have not looked at Amazon, but non-cash write-off usually play a significant role in lowering net income. If you operations are sucking up cash, then the sustainability of the business depends on ability to inject new cash from somewhere else.