It's interesting that you brought this up, when we sat down to write this, we didn't feel there was actually good terminology yet to refer to this space. We chose 'ride-sharing' as the least-bad way to refer to the industry after informally surveying what journalists had been using so far, for consistency. At least for Lyft, Sidecar, and UberX, the 'sharing' part makes some sense to me because you're sharing another person's vehicle that they possibly already owned, while for Uber Black and Lyft Plus, these are professional services so the term is less appropriate. I would definitely welcome a new term to describe the rides space.