If I become a parent, of course I will not let my child get to know gambling or others first before earning their own money, I will not show that I also play gambling in front of my child or even I allow it with reasonableness in the future in the child's growth period.
Even if it is indeed a range with the ease of information in the media, in my opinion, as a parent it is necessary to limit them with the money they manage, and give money only for school supplies with more limited money rather than excessive, because if giving excessive money to them will make them more money and have many opportunities to use that money with other things including gambling, drugs and other things that are negative for the development of my child.
We can always try our best to make sure that our kids have the best that they want in life, and we can also try to restrict the kind of information they get their hands on, but we can't completely control that. Just as you have outlined, the use of social media makes the parental control job a little bit difficult.
Even if you try to reduce the amount you allow them to have access to for their upkeep, if they still want to spare some that could be used for gambling, they can still do that as long as they have time to go out and mingle with friends. Everything can be made possible.
That affects the possibilities though as parent or guardians it's needed to keep an eye in each venues or places where our kids are navigating as the use of social media with their devices can triggered interest after they witness something from those adults that surrounds them, you need to make sure that you are doing your best as concern adults for the benefits of those young minds, best to keep them involve into something that will allow them to consume them, better if it's physical interractions that will keep them away from any device, lesser chance of geting involve in any gambling activities and better monitoring of what they are doing while interracting to somebody else.