SoftBank and Postmates declined to comment. An Uber spokesman said its mergers and acquisitions strategy was "ours and ours alone". The market for food delivery was bigger than taxis and that DoorDash could be bigger than just food, eventually delivering all kinds of goods and services. Investors Combining with competitors to become more profitable is "not that insightful of an observation", Xu said, adding that he is focused on DoorDash's growth strategy.