How much do you tip DoorDash drivers?

I’ve never used it before

I want to order 10$ of food from Wendy’s (I don’t have access to a car or public transport right now and have to get groceries delivered tomorrow)

But 10 bucks ends up $14 after DoorDash fees (even though DoorDash claims it’s free delivery… obviously a lie since they’re charging over $3 for “fees”)

I heard DoorDash drivers only make what they get in tips so I feel like it would have to be a min of 5$ tip

But then I end up paying 19$ for a 10$ meal and that just feels crazy to me.

Wendys is 2.5 miles from me/11 min drive *******

What should I tip?