I don't usually do this, but I'll make an exception.
This 'seller' isn't very cooperative, avoids some answers and doesn't offer vouch copies, so I guess it's fair to express my opinion here.
I think he wants to offer a guide on how to make multiple Uber accounts, verify them with disposable phone numbers and use free and/or empty virtual/prepaid credit cards.
You are always billed for the Uber ride at the end of the ride. However, if you don't have enough balance, you will have to pay the debt in order to use Uber again.
After your account is on debt, you make another one and so on. The Uber drivers ALWAYS get paid, regardless if the client has balance or not. Uber covers all expenses for them.
If this isn't the method you're selling, then please disregard my ideas. However, you could try to be more friendly and offer a review copy or provide more details.
Best regards.
p.s: the 'method' above was not tested by me or anyone else, it's just an idea I have. I only have one real account with them and use them regularly. Because Uber is kind of new in my country, I benefited from inviting a dozens of friends and gained free rides anyway.