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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.
Until then, tip people with cash.
Good luck with the logistics of that. Just ban tipping. It's bad for business, bad for individuals (in the long run), and a highly discriminatory practice.