You're conflating three very different types of jobs here.

Minimum wage hourly jobs like grocery baggers need to be able to survive off a 40-hour week, and it's a societal problem if they can't.

Taxi drivers are essentially sole proprietors who set their own hours and accept higher risk for a higher payoff. Demand and supply will calibrate themselves unless the government distorts the market (eg. taxi medallions).

Musicians and actors are and have always been in a brutal power law market where all the wealth accrues to the 0.1% at the top of the heap. This drives exploitation since people will do anything to get to the top, but at the end of the day society does not need them the way it needs taxi drivers or grocery baggers and there is no economic rationale for subsidizing them.