Yes with smart phones everything is easier to access, so a lot of young people who see online gambling are easily attracted and try it, even though their economy is really not in time, they are still in school and some are still very young to know gambling, and that is the real danger.
We often blame the young lad for doing what they are not supposed to do before their age but we as the guardians failed to do our own part of the scrutiny. If a child lives with you and eat food under your roof, you have every right to restrict them of some things but before the restrictions, you have to educate them about what we warn them about, that way they wouldn't be able to raise any curiosity of what you are trying to avoid them towards.
It's a growing concern among our society and what caused it majorly is because they want to make money in their younger age as that is what the society now does, money precede everything today and that is how they become addicted to gambling due to lack of experience and money loss. By the time they try to get back the money and the don't make it, the consistent loss can make them addicted to the point of losing focus about life especially education.