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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.
I've never used any of those services. If the restaurant doesn't deliver, I pick up my order. I also try to go to the restaurant's website and use whatever ordering system they have there, under the assumption (perhaps mistaken) that the restaurant chose that ordering system because it was the best deal for them.