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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 taxman does not notice, because the tax is paid. it's paid by the drivers.
Tips aren't taxed.
https://www.irs.gov/newsroom/tip-income-is-taxable-and-must-be-reported