I want to tell my 12 years old cousin to quit his YouTube channel
Why do you think that he should quit?
Doesn't he need to know that YouTube is a tough world?
It is nice that you are trying to look out for your cousin but it is good to encourage your family. We all need some support sometimes.
He says he's getting mad views and ad money- I think he needs to stop making videos...
I know you're being protective about your cousin but if he's enjoying making videos let him do it. Yeah it's a tough world but let him learn it from his own experiences. You should encourage his activity with certain precautions.