Because in practice you’re gonna need a cable anyways, since it’s a vanishingly small chance that your phone’s port lines up perfectly with your computer’s port when you set it down.
Maybe you can find a book that’s just the right height to put your phone on (RIP if you have a desktop), but just having a cable is still a better option.

This is either a male/male adapter, or a thumb drive… In either case, a-to-c USB cable would be a better solution, and a less confusing image.