He probably took out a loan to buy a nice car/limo to do Uber Black work. Since the rates dropped, he probably can't make the monthly payments, let alone maintenance and gas.
He more than likely purchased multiple cars in order to run a business using the Uber infrastructure. He may even have family or friends involved as drivers. If he purchased a luxury car outright, he could also have dropped $97k just for that vehicle alone since Uber Black requires a certain type of vehicle in exchange for higher fare rates.
Not asking in support/opposition of uber. Genuinely curious about what are some ways drivers could get into so much trouble?