You should tell that to the majoroty of (my Seattle) Lyft drivers that bought a Prius just so it could be their primary form of employment. From my personal experience it is only in the Bay Area that people use ride share as a supplemental income.

Also anecdotal, I've used uber in DC many times, and many, many, many times in Toronto. Almost every driver I have has was supplementing their income.

I've found that all of the Lyft drivers here (also Seattle) that start conversations drive as a side thing. I have no statistics, but it appears you don't either.

Another anecdote here - spent a few weeks in North Carolina. Every Lyft driver we got while there was doing it as a supplement to their income.