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There is a difference. People are far less likely to go themselves, so that may be manageable by the restaurant. The app brings a lot more orders in. The restaurant possibly solved the problem by telling the delivery platform. If they suddenly had a bunch of couriers showing up at their door at peak times their solution would likely be similar, by telling the customer that they live too far away so they won’t let them order takeaway or something else along those lines. But the restaurants probably prefer to deal with a single party that can handle that bit of customer satisfaction for them.