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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.
Sounds like it is annoying even if you tipped well to start with. Glad I stopped using those apps a while ago. The only value they have to me now is to browse local restaurants when I can't think of a place to go. And a lot of times I just end up eating at home anyway.