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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.
The best thing about gig deliveries is dropoff service imo. I never see the driver so cash isn't an option. Uber eats at least makes it easy to adjust tips and I often do adjust if surprisingly early or if they forget a drink.