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DoorDash now warns you that your food might get cold if you don’t tip
(www.theverge.com)
This is a most excellent place for technology news and articles.
The word 'tips' originally came from an acronym "To Insure Proper Service".
As a great etymologist once said, "it's never an acronym."
"Ensure" would be the correct word in that context
I heard it as "To Insure Promptness".