Yeah it's insane I did it for 2 weeks when they changed the requirement to 2011 on Lyft for the PDB when my BMW no longer qualified . My weekly bonus paid for the rental and then I had a good $40 a week savings in gas but I quickly just bought another car with a monthly payment only slightly higher then the Hertz rental , That works on Uber Select as well . Then like I said earlier had it for almost 2 months after I bought my new car and the next day someone ran a red light and hit it.
But those rental programs are too expensive , you're better off even with crappy credit saving $500 and going to a crappy dealership and buying a 2012 Nissan Versa , I've seen those for as low as $5,500 they get good gas mileage, are reliable , kinda spacious for a small hatch and even at a 21.9% Interest rate on a 4 yar loan would only have a payment of about $170 a MONTH and insurance would probably be well under $100
My biggest issue with the Hertz rental is that you limit yourself to Lyft only , that means if you get a DIA ride you're chances of getting a return ride are very slim . With Lyft and Uber it's very easy to get return rides . Now you could add your Hertz vehicle to your personal insurance , and then take said hertz vehicle to the Uber office downtown and they will approve it on the uber network. But I wouldn't recommend it