> Kindly go away and chew on this while you do so: if everyone started their own billion-dollar business like you claim it’s possible (and plausible) to do, then that means the cumulative wealth available out there is literally infinite and currency has no relevant function.

Nope - the 'free market' would just cause enough inflation to scoop away all that infinite money and make things end up exactly like how they are now. A tiniest minority at the top, living more luxuriously and comfortably than the feudal kings of old by doing less work, an overwhelming majority at the bottom struggling to survive.