Cheap, convenient and almost gone: Uber, DoorDash and similar apps

One thing I don't see reported very often is the one figure that is most important. Unit profitability. Whether they are profitable it not while growing so much is of no consequence.

Is Uber profitable on a per ride basis? Are these other delivery companies profitable on a unit basis? If not, are they close and will small price increases make them profitable?

What's worse is that SV has been buying popularity, influence and political points with that money. Does the money run out though? There must be huge fat to burn before SV runs out of it.