Are Interviewers Asking You To Do Work For Free?

I was recently asked to answer the following question on Quora:

Interviewing with Uber... how would you answer these sample questions? These are more open-ended consultant type questions. Not really looking for exact answers, but rather just ways for me to think about how I should respond. You obviously don't need to look at all questions, just general feedback would be great!

A) An Uber competitor opens in your city with unlimited cash capital, if you were them how would you steal Uber's customers? 
B) If you were Uber how would you convince drivers not to leave?
C) Say an Uber black car driver makes $30/ride with a 20% commission. How do you convince him to upgrade to a new made up service UberSuper with a 25% commission? What costs will the driver incur in upgrading. (Math is required to display)
D) How do you sell an existing taxi driver on using Uber?
E) Why don't taxi drivers like using Credit Cards?
F) What's the KPI for the quality analysis?
G) What's the difference between UberX and UberPop?
H) If we ask you to find us 100 new drivers this month. Describe what steps you would take? How about the next 1000?
I) If nobody knew about surge pricing, how would you explain it and justify using it? How would you go about implementing it? Specifically, based on what factors would prices be changed and in what regions?
J) How would you supply drivers in a new product in a launch city?

My answer: Uber is not looking for "the right answer" to these questions. And they are not looking for you to do work for free.

Uber is trying to understand how you think about complex problems and how you reach a conclusion that is both defensible and actionable.

They want to see you "show your work" in the moment.

How agile are you? Can you think on your feet? Can you respond to having your ideas and thought process challenged "in the moment"? Are you going to be looking at challenges with fresh eyes, and a constructive, non-duplicative perspective?

By seeing you work through such topics, which will of course give the interview team a sense of your familiarity with the domain, Uber will be able to determine: Is this a person I would look forward to collaborating with each day? Is this is a person that can help take Uber to the next level?