GP is pointing that this challenges appears to have already been solved, quite successfully, by many small non-technological business in many cities. Was it snarky? Yes. But it was also insightful.
Pointing out that pizza (or other food) delivery is a very well-established practice that's been carried out successfully all across the globe for a very long time isn't being "snarky".
He's merely stating the obvious facts that, for some reason, a lot of people here are totally overlooking when they think that this idea is somehow "innovative".
