Let's use another analog: Kids want sweets and parents either agree to buy that and no longer bother with their diet, or saves money to go to the candy store. Yet if a kid gets too unhealthy we (IMO, rightfully) have CPS sent to their house to investigate their home life.
Kids were never meant to be a convenience. And parents talked about here aren't rich enough to delegate their parenting off to someone else. Take a few hours to research what you give to your kid and monitor what they might get outside of your vision.