That's not my understanding. I've read that they earn less, and drivers I talk to say it's hard to make money. Also remember that Uber drivers are contractors and get no benefits or other employee protections. Uber does place plenty of stories and op-eds saying otherwise, but I need to see some actual data.
Many things are 'not ... great', but some of them are much better than others. Homelessness isn't great, neither is a low-wage job and public housing, neither is a decent paying job with an awful boss, neither is being a graduate TA at MIT for an awful professor - but some of those are clearly better than others.
The drivers I've spoken to mostly thought that Uber's entrance into the market had hurt their incomes significantly. Of course, that's hardly a representative sample.