Cash only isn't unheard of. I carry a little bit with me. But it's pretty rare for something like a cafe, restaurant, etc. and I expect a lot of people don't carry cash especially if they just stick a few cards on the back of their phones.
That said, I'm pretty sure this is just an exercise in imagining a very retro sort of establishment. I have a lot of trouble imagining a place like this working.
That said, I'm pretty sure this is just an exercise in imagining a very retro sort of establishment. I have a lot of trouble imagining a place like this working.