https://techcrunch.com/2019/04/10/cashierless-amazon-go-stores-are-planning-to-accept-cash/

Amazon Go convenience stores will begin to accept cash, according to a report this morning from CNBC, which Amazon confirmed. The retailer didn’t say when cash would be added to existing stores as a payment option, however, only that it was planned. The issue with the cashierless, automated Amazon Go stores is that they require customers to use a stored bank or credit card associated with their Amazon account to make a purchase. This can be discriminatory towards the un-banked and under-banked, who typically pay with cash.

CNBC points out also the change comes at a time when many cities are enacting legislation that would ban cashless stores – that is, stores in some markets will be required to accept cash, as a means of catering to the unbanked who account for around 8.4 million (6.4%) of U.S. households.