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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.
That's what I do with my drivers. Whether it's 20 bucks or 11 or 15 I just do $5 if they're cool with me and that's usually the case