That never happened. There was never a time when worker rights were won at no cost for workers themselves.

Families were against child labor laws because they would be losing important streams of revenue. As a result, it took several decades to finally regulate the practice. In the meantime, children were exploited and died, wages were kept low because supply of children workers was always high, and mining and industrial companies thrived up to the peak of the gilded age and the subsequent Great Depression.