I will say that the fate (future) of each student is in his hands (mobile device). Can we blame the casino in this case that students waste their time gambling (chasing a mythical win) instead of studying? Of course not. Students themselves are to blame for wasting money (and time that could be used for studying) allocated for studying on gambling. Also, their parents (or other mentors) are to blame here, who didn't instruct (didn't educate) them properly to develop resistance to the temptation to get quick and easy money (gambling).

If you are weak to external (30% of students) influence (luring with big wins), then you should not blame the casino (which is just doing its business).