Restaurants?
So how will this affect restaurants, where the server usually takes your card and the signed receipt to swipe somewhere else?
Some of the restaurants have Android tablets-with-card-swipe, but these are incredibly poorly implemented and so far I refuse to use them. For example, they let you play trivia games, and then charge you for that. As another example, they're on a separate wi-fi network from the patron wi-fi network (smart) but the wi-fi password was the chain name (dumb)
Then they expect you to pay through the device, so if you want to pay cash, you then have to get the server to come back and deal with it. You can guess how well that's handled.
Biting the hand that feeds IT
