there is nothing wrong with an "academy" like construct with voluntary signing up, where the adults are held responsible for the teen heroes, and the teen heroes are allowed to practice as heroes with limitations.
But that is not the question. The question is what happens when they refuse to play ball and start breaking the law repeatedly by teen heroing around without any license? The title is called "outlawed" after all (i don't even know if there is going to be some license system or if it is just a blanket ban like underage drinking)
How will the law be enforced especially in hero comics?