Funny you should mention that on this story...
Just so you know, it's a 3rd party doing that delivery.
In Malaysia and Thailand some BK and McDonald's deliver. But then again, I don't know if it's up to them to decide or if it's being done because of the competitive environment. You can basically find great food at almost any given time within walking distance.
There's the competitive aspect in economies where street-food is the norm but then keep in mind that it's dirt cheap to deliver there. In Thailand a delivery worker earns 220 USD a month.
Maybe they've all done the math and it doesn't make financial sense, I don't know. But there's certainly nothing inherent about the type of food that makes it impossible; I've had great burgers and fries delivered by a few independent restaurants.