It's regulated in Japan, so if you are from EU or US you are not covered by the same customer protection rules as with some other exchanges. Also, it accepts only crypto deposits and crypto withdrawals. No cash as far as I know.
If Amazon will adopt a sort of crypto for their payments it will for sure not be any of the existing ones. They will create their own as gigantic companies need to be in total control of every aspect of their business, especially the financial one that has potential to disrupt the flow of...