When people have nothing to lose (i.e. poor, nothing to sue for if they got into accident with insufficient insurance), a marginal vehicle (that they don't mind depreciation on), desperate for money, need the flexibility because of other responsibilities, these ride sharing gigs may be better than unemployed.
Many people already have good paying jobs, nice cars, a lot of assets to be sued for in an accidents, need to buy expensive insurance to protect themselves, etc. Ride sharing is not for them.
There is a reason these companies' insurances only "protect" the passengers when they are riding, and not when the drivers are going to pickup their passengers. If you are hit by a driver going to pickup the passengers, you better have uninsured motorist insurance or a good lawyer.
Minimum wage reduce the number of jobs available, end up with some people making more money and others unemployed. Those unemployed (too old, not as productive, not attractive looking for customer facing jobs, etc) may end up in gig economy as contractors, making less than minimum wages, balancing the workforce demand and supply.