If you wouldn't, that means there is room for them to grow ...

No, it really doesn't.

If you charge people $100 to deliver a loaf of bread and you have 0 customers it doesn't mean anything about your potential market size or equilibrium price to deliver a loaf of bread, because you have 0 data points.

What are you talking about? They logistics market is already huge, and the robot taxi market will be too, as the technology improves.