(credit: Sergio Ruiz) Attention, Uber and Lyft drivers! San Francisco wants to rake in money from you. On Friday, the treasurer for the City and County of San Francisco announced that he had begun mailing out business registration notices to the "nearly 37,000" people who drive for "Transportation Network Companies," the formal name in California for such on-demand companies. The city says that these drivers are required to pay an annual business registration fee of $91 per year for operating a business in the city—which includes being a driver for a company like Uber or Lyft.