All you see as a Dasher is that there is a new delivery for a 'guaranteed minimum' of $10 which in this world means that you will almost never receive anything other than $10. You take the job, deliver the food, and find out after that $3 of that was tip. You take another $10 job and find out that $0 of that was tip.

In this world there is zero expectation of a tip because almost no one tips outside the app and in-app tips are worthless. The reason tipping is expected is because ...it's expected. You're an asshole at a restaurant if you don't tip because ~15% is the baseline, in DD's world the baseline is 0%.

I'm not exactly sure why you're trying to guilt yourself into paying more for the exact same service to a person that is not expecting anything extra. You're doing the equivalent of tipping the cashier at the grocery store.