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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 apps default to "leave at door" and most people don't expect a knock since they are the ones who ordered and have an app that will notify them food was delivered (if they weren't following along every step of the way like most people do)... Has nothing to do with being "scared".
That makes sense.