Is there enough demand for non-standard food types (I have to imagine more folks get pizza delivered, than say, sushi) for each restaurant to maintain their own

Is there enough demand for non-standard food types (I have to imagine more folks get pizza delivered, than say, sushi) for each restaurant to maintain their own group of drivers? Not saying the end result has to look like uber eats, etc, but there do seem to be efficiencies from having X drivers collectively cover Y restaurants, with X << Y