This is the biggest part that is misleading and makes a good service a bit shady.
I tip well because I wanted my food to be handled well and the driver to get a nice payment out of it. I also want the driver to make sure the order is good and correct, I am willing to pay extra for that. Now DoorDash is telling me they decide that for me and the driver. I think they should do something to change that or at least remove that message.
I have also read on reddit in the subreddits for these services like /r/doordash/ that because they pay low for some routes, even if people tip well, that dashers double up on deliveries. Sometimes the service asks them to and knocks their acceptance rate if they don't, or offers really far deliveries for cheap. I wanted to tip enough so they weren't racing or doubling up.