- DoorDash added a 'tip nudge' feature in June, which reminds customers to tip.
- It's the latest example of how common tip requests have become for food delivery.
- Some gig workers say their base pay is just a few dollars for each order, making tips a key source of income.
Customers have long been asked to tip the people who deliver their take-out or groceries. Now, that pressure is even greater, thanks in part to "tip nudging."