From a tax perspective, this seems dubious at best. IRS looks very carefully at people claiming to operate a business (filing a schedule C, as one has to do for Uber expenses) and claiming a loss continuously. I can't imagine they wouldn't see this as fraud since the person clearly has no real intention to be an Uber driver.
First wanted to say this ^^^. My memorized rule of thumb, was IRS would declare your business a hobby if you didnt show a return in 3-5 yearsish.
With that said, this how I paid for my current daily driver. After trade in, I only put 7.5k cash into it. After plotting with the wife to check my numbers - I signed up for Uber and "sold" the IRS roughly 22k miles across two tax years. Since I had plenty of taxes paid via our W2 jobs, I cut my tax bill nicely in those two years.
However, would I try that with a Model 3? or a Model S? Ignoring the insane # of miles you'd have to put on the cars you still have tires to deal with. Further, thinking it through - if I wanted to generate a $300 "loss" per day thats 500ish dead miles to put on the car and at least two battery charges (which eats into your driving time quite a bit).
Ignoring the Tesla models - there are plenty of used sedans that would "qualify" for Uber Select that would cost less than 25k used.
I'd love to hear how this works out in a year :)