Those places advertise on door dash because that’s where everyone looks by default.

We don’t have door dash but something similar where they either have the door dash drivers or they forward the order to the restaurants which have their own drivers. And those with their own drivers often will give you the restaurant’s card and ask you to order directly because of the high fees.

Personally I really hate calling so I only order from the restaurant directly when it has a website. Calls just suck because I might have trouble understanding the other’s accent or they mine. And it is much less error prone when everything is in writing. Especially when there are special requests. And not having to juggle payment at the door is a plus as well.