DoorDash and Uber expand into Costco grocery delivery

DoorDash launched same-day Costco delivery covering more than 4,000 products through linked Costco memberships, while Uber Eats competes for the customer relationship and Instacart faces pressure. The effect on courier earnings, workload, safety, mileage, and net income remains unverified; the Austin DoorDash shooting also underscores serious personal and legal risks for couriers.