Till-free ("no checkout") store is ideal setting for cryptocurrency payments

Amazon recently opened its first "no checkout" store in Seattle, now followed by Sainsbury's opened similar "till-free" store in the UK. Such environment, where there is no cashier or even point of sale per se, is ideal for cryptocurrency payments. Till-free/no checkout stores are obviously unsuited for cash payments (or vice versa?), so the only option (besides crypto) is plastic card, or the card linked to your mobile phone app (i.e. Apple Pay). But what if you need some privacy and don't want to use plastic card? Maybe privacy is not that important for some people in grocery stores, but there will be other kinds of till-free stores... Or you simply don't have a bank account and plastic card, or your card is not accepted by Apple Pay? Here crypto goes on stage, because it combines the best features of two words: cash (it's anonymous and secure) and plastic cards (it's virtual and can be used on mobile phone).