Not that I doubt an article on a predatory loan website but…
You make the assumption that they are driving ~3800 miles a week and I can tell you, as a truck driver who is mostly out on the highways, there’s no way in hell they are doing those kinds of miles city driving. That’s like 550 miles a day seven days a week.
When I drove a cab the lowest rate was $1.45/mile (for medical vouchers) and some days it cost me money to haul people around and my expenses were only like $140/day (gas + lease). Though, once in a while I’d have a really good day with some big cash calls and take home a few hundred bucks but mostly I averaged ~$100/day take home (before taxes which I didn’t actually pay). Mostly, depending on the season and what was happening in town.