Yes. Uber and Lyft have driven many taxi companies out of business. SF Yellow Cab and LA Green Cab are the two largest ones. Uber and Lyft ran at losses for years losing billions of dollars to keep prices low and drive people out of business.
"San Francisco's Yellow Cab collective is not stopping service. You'll still be able to spot, and maybe hail, a Yellow Cab in San Francisco. It says business is still strong and that it averages 15,000 fares a day in the city. The chapter 11 filing will allow it to restructure its debts, it said in a statement. "
From what I can tell the company is still around. They have relatively recent Google reviews and there are posts with complaints about them on Reddit all in the past 6 months. I think it was acquired by a competitor (CityWide) through the bankruptcy, which then rebranded as Yellow Cab.
The point is SF still has traditional cabs and they compete with Uber.
