I DoorDash regularly. I frequently get offers so low that it's not worth it in gas+time to deliver them. There's a chance that a lowball offer will tip me after the fact, sure, but it rarely happens, probably only one time in ten.
If the initial offer doesn't tip, and not just tip but enough to make it worth it relative to the travel distance and time, then I don't accept it. No experienced driver would, and no driver should.