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Evening the gambling companies will be aiming at a targeted audience, students will be the least on that list because they know there people in their majority are not earning but are dependent on a guardian or their parents for money so mostly their source of income is such that will not allow then gamble at a certain level of which most casinos make a greater chunk of their profits from hig and big stakers not the smaller stakes from gamblers like students.
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Though, I have seen with my very own eyes who there are some gambling services here in my country who dont even care to offer their services to minors.
It was the case with someone in my family who was around sixteen years old when he walked to a betting/gambling place and was able to place a bet with no questions asked and with no ID card verification. Nothing at all.
So, while it is true there are casinos who are very strict on what their target audience or population is, there are some small gambling businesses who welcome pretty much anyone with money on their hands, for the sake of money and pushing their place higher as a company, and obviously that is wrong. There is little we can do, but to educate those who we care about and not to allow our minor family members to engage on activities which can lead to psychological addiction.