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Tipping 'nudges' are now popping up on DoorDash. If you don't leave a gratuity, you'll hear about it.
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It's born from the same idea that people will pass out Halloween candy with blades in it. Which is a thing that is everyone "knows" about but has never actually been reported to happen.