If someone works for two companies such as both Lyft and Uber are they still a dependent contractor? If you have more than one source of income that seems to be

If someone works for two companies such as both Lyft and Uber are they still a dependent contractor? If you have more than one source of income that seems to be mutually exclusive with being dependent, no? What's the criteria for determining whether someone is a dependent contractor? I'm not against the idea, but it's important to have clear unambiguous criteria.