While child labor is viewed negatively, apparently child labor and child slavery aren’t the same thing, and child labor though it could still be exploitative/cruel in other ways, can be done voluntarily by the child, and with fair treatment/compensation/etc.
I suppose you could make the argument that any child labor opens itself up to problems, but could it be done responsibly? And if not, then at what age do we draw the line of labor being not ok regardless of consent?
Chores are different in that the purpose is training them to be self sufficient adults. Once it deviates from that purpose, it becomes abusive.
Wash the dishes after dinner - ✔️
Wash the dishes after daily closing for our small family restaurant so mommy and daddy can get everything finished up earlier - ❌