I agree and I get it. But at the same time, it is only used for payment and discounts at grocery store. Payment with a card is even less secure here in US. So, I do not think that Amazon Go was particularly unsecured since it was just for credit card payment.

If someone manages to replicate my pulsing blood vessels from my hand and trick the scanner, that would be fine. I would dispute the purchase, and the store would not even pull the camera footage, and just refund.

Amazon Go was not used to hold access to bank accounts or crypto wallets. I think it was a good technology and balance between convenience and security, for the purpose (grocery loyalty and payment).

A twin or even sometimes a relative (son and mother) can open an iphone and its banking apps using the facial recognition. That is more concerning to me than Amazon Go palm scanning for groceries.