They are monitored by the firm. They don’t have the option of working for other companies. And they are entitled to all the protections that come with being an employee. The Supreme Court today potentially blew up Uber’s business model, and the model of many other fast-growing ‘gig economy’ companies as well, with a ruling that drivers for the app operator are not self-employed after all, as the company likes to claim, but staff, and should be treated as such.