A “quick haircut” sort of place (kind of a barber, sort of , but super-high-volume and just one worker, the owner) that I’ve been using for a while now has a super-annoying dark-pattern in their payment flow. They book appointments, and take in-person payments using Square. After your cut, when you’re paying via their hand-held kiosk with a card, the screen shows you a bunch of huge “tip amount” buttons, and it’s implied that the customer has to choose one of them, while the provider looks on, in order to finish the transaction and leave (probably not true - they’ve already got your CC info by that point). Guess which button is highlighted/pre-selected and front-and-center! That’s right, 20%. If you want to select another tip, or no tip, you have to select another button while she watches you do so. The owner lists all prices on her square website, and it’s those prices you think you’ll be paying when you book an appointment online, but she still feels the need to be tipped. You KNOW that the provider/barber has configured Square to present that UI to the customer. Not quite the same as the restaurant fees scam, but it’s actually more manipulative though, in my view.