Postmates delivers from corner-store shops like Walgreens and retail brands such as Apple and American Apparel, but the bulk of its business is in traditional restaurant takeout. The company is valued at $450 million, and its delivery fees can easily top $10 for food that costs less. On DoorDash, a food delivery company last valued at $700 million, delivery is usually between $4 and $7. Uber-for-groceries startup Instacart charges as much as $12 for delivery on each order. It’s worth a whopping $2 billion.