The urge to participate in risky activities is an intrinsic part of moving into adulthood. Take gambling from them, and the same adolescents will start doing drugs, alcohol, engage in random sex etc. Also, they are extremely sensitive in this age, so you can't fake it for them, you can't just feed them with "simulated gambling and other forms of gambling-like behaviors", like the article suggests, because that would be a pill they won't swallow. They need something real. They want to do something what adults really do, and not just average adults, but the most daring ones, from their point of view.
In short, eradicating a problem, gambling in this instance, you can cause more problems to emerge, which are more severe than the eradicated one. So, forbidding your child to gamble or to drink beer, think twice with what he/she can replace it.
Excessive effort to make money. If you run out of money, gambling addicts won't stop. He would instead look for ways to earn more money, even in an excessive way. The most extreme way to try is to borrow money from loan sharks or steal.
The consequences of gambling in young people are that they become patients of depression, hypertension, loneliness etc. in young age. it is because they spend most of their time in online gambling. They want to make extra money for their enjoyment and that is the bad thing because when they have no money they can do illegal activities for getting some money.