This role is played by the smart phones in China. The customers pay by scanning the printed QR code, and upon success, the WeChat or Alipay app on the vendor's phone reads out the amount loud.
People don't automatically be free if every western company stops doing business in China. Withdrawing from the market can't really do anything about that unless it can put a lot of pressure on the power holders.
> I'm more of the mind that happiness is better as a side effect of a good life than the sole pursuit of your life. People who chase happiness as their primary meaning to exist usually are not very interesting and highly materialistic.