Tipping did not spread on its own; the prompt spread. Pew Research Center found that 72% of Americans say tipping is expected in more places than it was five years ago, and that Americans are more likely to oppose (40%) than favour (24%) businesses suggesting tip amounts at all. The change is largely a change in hardware. Counter-service businesses that never had a tip line now hand the customer a payment tablet that asks, with preset percentages already selected, while the person who made the coffee watches. That converts a discretionary reward paid in private into a decision made under observation, which is why the same person can be in favour of tipping and against the screen. Pew also found no settled norm to fall back on when the screen appears: 57% say they would leave 15% or less for an average sit-down meal, while about a quarter say 20% or more. There is no right answer to default to.