"What will happen to the kids who lose their jobs when the Biden administration rightly cracks down on employers?" You can't just fix one broken outcome when the system is broken. ICYMI @chavezlinda on America's child labor problem: https://www.thebulwark.com/why-we-have-a-child-labor-problem/
Why We Have a Child Labor Problem

We lack the procedures, resources, and political will to protect immigrant children.

The Bulwark
@bulwarkonline The child labor problem could be fixed by creating an economy that facilitates one parent’s income covering all household and child rearing expenses, and regulating greed at the top. Companies hiring children, do so to increase the wealth at the top by paying children less. It’s time the wealthy stop oppressing and exploiting the poor and middle class.