What a ridiculous thing to say.
Parents who work full time still have their children live with them.
I shouldn’t have to explain that is quite different - physically, mentally and emotionally - to being sent away to live with people who are most definitely not your parents.
I feel awful for anyone who has to do this pre-secondary school. A child needs parents and security, not to be sent off to be at the mercy of others. And yes it is at the mercy of others. Perhaps their environment will be wonderful, or perhaps they will be abused on a daily basis, as we hear so often about historical institutions. Humans are humans, where there is vulnerability and opportunity there is also abuse sadly.