My 9yr old ( who has been watching YT for 3 years ) asked mom if he could start his own YT channel. She loves the idea, while I can see it becoming a pandora's

My 9yr old ( who has been watching YT for 3 years ) asked mom if he could start his own YT channel. She loves the idea, while I can see it becoming a pandora's box. Is 9 too young?