What's the problem with the traffic being driven away from the web site? As long as it would be coming through their API (think of centralized API for local foo

What's the problem with the traffic being driven away from the web site? As long as it would be coming through their API (think of centralized API for local food joints), and they get their cut it's all good. But I see valid reasons for not providing APIs like that. Imagine someone creates a gadget like that and there's a bug, instead of 1 pizza it orders 10 of them. A delivery guy comes with 10, and no one is willing to pay for that many. It wouldn't take long to infuriate enough food joints. Well, yeah, you could pay with credit card when placing an order... But I never do that, I just avoid using my card on web if I can easily do it :)