[throwaway373438]

"But the full-time drivers are the one stakeholder class that created much of Uber's value"

This is not a true statement. Uber is not worth $55b because they have performed a lot of driving work. Uber is worth $55b because they have constructed a system in which driving work can be easily scheduled and allocated.

The value is the system and the system was not created by drivers.

The system was created to serve drivers and riders together.

"yet receive very little of the value they created."

They have received all of the value from the driving work they performed, in the form of a 1099 paycheck. There is a fairly clear market rate for driving work.

They did not contribute to the construction of the $55b system.

"How much of Uber's value do they deserve? "

None.