I've lived in Costa Rica before and have seen a lot of children who are forced to work. The first few years I was shocked, but after a time you tend to become numb to it. Child labor, no matter what type it is robs children of so much. They miss out on being mentally stimulated at school, social interactions with other children, and playing. Children who play learn so many things, group interactions, friendship, dependence etc. 

Here's a case study on how child labor affects children: https://www.worldvision.com.au/docs/default-source/school-resources/how-does-child-labour-affect-children---india-case-study-worksheet.pdf?sfvrsn=2

I just read it, and wow. Not only the educational negligence but the health and perpetuating poverty were also pretty high on the list of how children are affected.

You could argue that working in crypto as a child is not as bad as a sweatshop in India, but there are still consequences.