The Wall Street Journal reported on the rise of digital, self-checkout kiosks and how customers have responded to tip prompts. Many customers who were asked to tip workers with whom they had no interaction were frustrated with these prompts, per the Journal.
There’s no social obligation to press yes
The social obligation arises from tipping, which is a social obligation people are raised with in the US. The human brain is funny and transfers this obligation to any time they are asked to tip.
being asked creates social pressure