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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.
I don't think people should even be expected to tip if the service is exceptional. It places a lot of social pressure on people who may not be able to afford a tip and weren't expecting to need to give one. If you MUST have an additional incentivisation system for good service, a better way to do it would be ask customers to rate the people serving them (digitally) and just use an internal reward system.
I don't personally like the idea of being expected to assign a numerical value to a living, breathing person either way.