Sure. I know one way they could make a hell of a lot of money.
But seriously, I wouldn't mind young people working at a somewhat earlier age than they do now in the US, nor would I restrict their type of work. However I think what makes us suspicious of this type of employment is that the parents or some other person may be coercing them into the job - certainly we allow parents power of coercion over children. Of course they may also be forced into it by poverty.
I think if there were a reasonable social safety net which prevented extreme want, and some reasonable limitations on parental power over children, there would be no harm in them engaging in some work.