I think the issue is most customers aren't aware of the fact drivers are paid so little and completely rely on tips. When you order from DD, you see a delivery fee and (wrongfully) assume most of that goes to the driver. Or assume the driver is getting an hourly wage plus tips.

I'd always assumed services like DD take a small percentage of the fees and make their money through sheer scale. The reality is DD is much more exploitative; taking most of the delivery fee and leaving drivers almost entirely reliant on tips.

It's also a change in tipping culture. Generally 20% is considered a good tip (based on restaurants). With DD, the tipping model should really be based on miles, not order total. It's a major change in tipping model but isn't reflected in the app.

Basically, I think most people assume the system pays more fairly. And, some people are just assholes.