(Also a parent) there are two ways to use Youtube. One is to let the child choose what to watch and, I agree, this is a disaster. There's no possible guardrails that would work with their current algorithmic models. The other is to find things they (or I) are interested in, particularly tutorials, and then watch them together and then apply that to real life. It is a fantastic tutorial device and my kids have learned how to do things I wouldn't have known how to do or teach myself. I don't think there is a better substitute for this use case.