You're not talking a lot into account, especially that drivers are freelancers who own their own vehicles. That $6 per 15 minutes turns into $24/hr (if you're literally non-stop taking fares, which is impossible).

Then you have maintenance, wear, healthcare, retirement, etc... Just accounting for fuel and maintenance these drivers are making minimum wage without any benefits, even if they drive full-time.

The so-called gig economy is bullshit that erodes just about everything it touches, from workers rights to public services.