Don’t forget in most cases the tips don’t actually go to the drivers. Doordash may guarantee the driver will make $7 for a delivery, then if you tip anything under $7 doordash will just pocket it. Seems like a good business model.
https://doordashdriver.blogspot.com/2018/01/what-exactly-is-... https://news.ycombinator.com/item?id=17789958
If I were to use DoorDash, this would actually give me an incentive to tip $0 via the app, since, otherwise, $6 of my fees+tips would be going to the company instead of the Dasher. I'd rather tip in cash (which I do have on hand at home, though I'd expect not everyone does, especially their target market).
Personally, I'd much rather have a delivery fee that translated to fair pay for the delivery personnel, instead of using tipping as an unreliable replacement for for/minimum wage. (At the risk of going off on a tangent, I'm OK with tipping for exceptional service/circumstances or for where there might be an extended/recurring service interaction, but I just don't expect that to be the case with "gig" delivery like this, unlike with traditional pizza delivery).
Do you have evidence that they're lying about that (which might be outright fraud and thereby a risky move)?
Or are you saying something different, that if a customer tips $0, DoorDash has to pay $7 (or DoorDash pays $4 to make up for a $3 tip, etc), but if a customer tips $7 or more, DoorDash has to pay $0?