Come on! The advancement of bitcoin has not yet become so massive as to really think that the school performance of the students of the world is seriously affected by their supposed involvement in this matter. I think they are cheating on you and their distraction is more directed towards social networks!
I can not imagine how the bitcoin could take their time, because not even those who really seriously devote to these issues we spent more than a couple of hours in this.
Although seeing it from another point of view, maybe they are the next Vitalik Butarin and you should support them instead of repressing them.