pretty much every technological advancement and the quality of life improvement that came with it is through capitalism. There's a reason that Cuba and Soviet Russia were basically trapped in time
May be a more important question is why those people lack those things you mentioned. If for instance Bill Gates/Jeff Bezos never existed, would it make those poor people richer? You are not addressing the problem when you simply vilify the rich as the cause of the poor's woes. Your argument is intellectually dishonest and I think it stems from unnecessary envy.