DoorDash Inc. ended a pilot of its voice-ordering product for restaurant clients, a year after it poached talent from an artificial intelligence startup to bolster the product. DoorDash's decision was revealed when a customer, the Donatos Pizza chain, said in a statement that it found a new vendor because the food delivery company was “sunsetting” its automated ordering features. A DoorDash spokesperson confirmed Tuesday that the company stopped the pilot at the end of April....