Exactly. Some services will add a variable percentage increase to all menu prices. It also turns out the quoted cart that Doordash gave me was $10 below actual

Exactly. Some services will add a variable percentage increase to all menu prices. It also turns out the quoted cart that Doordash gave me was $10 below actual cost at the restaurant, and from past experiences on other platforms I'm under the impression that Doordash would not have been willing to eat the miscalculation either.