This is like arguing that a kid will have more friends if they are allowed to smoke because everyone else does and it is a common social activity.
I do not have a phone and have lots of friends I see frequently, in person.
A kid will be able to form a small number of close friendships without a smartphone too.
Will they be able to have hundreds of "friends" in a parasocial relationship? No. Feature, not a bug.
I would never allow a minor to agree to the terms of service of any bytedance zuck products just as I would not give a kid cigarettes or vapes.
Knowingly exposing a kid to highly addictive harmful things is child abuse.