Earlier quoted context omitted.
> neither Lyft nor Uber has demonstrated a "financially viable business Self driving cars
In the magical future where self-driving cars will be able to replace 100% of what a driver does 100% of the time, what barrier to entry will protect Uber from competition? What stops someone from leasing a few dozen vehicles, and opening up their NotUber self-driving taxi service?
When that happens, any Uber employees still holding equity are going to take a bath. They will be holding onto shares likely worth less than what they paid in taxes to get them.