Food delivery doesn't necessarily let you share delivery routes, either. If you're paying for groceries, yes. If you're paying for two theoretically freshly-cooked dinners from a local restaurant, you want that food to come directly from the restaurant to you. The difference between ten minutes and forty minutes can substantially affect food quality and customer satisfaction.

As for food delivery robots, I mean, sure, but building a business that only succeeds if other people deliver world-changing technology at scale before you run out of capital seems a wee bit on the risky side.