Parents? They are responsible but most kids are learning gambling from the internet not from their parents so the growth of technology has to be blamed if we want to blame something. But as a parent it is important to talk about money to our kids and importance of managing it then these teens will know how much to spend because its not going to be their money on most cases.
In modern games (although probably not in modern ones), the element of gambling is very large, therefore, children learn to gambling even by playing ordinary children's games. And I cannot say that this is bad. By the way, children very quickly understand the value of money, even if it is "not their" money - for example, my daughter has her own budget and thinks well how to use it, because I do not give her endless money.
and this is true, even in my country, even though games on gadgets are entertaining, they are even used as gambling arenas by both adults and children.
there are several games that are indeed used as gambling arenas and are even on the rise to this day, one of which is Ludo King, which incidentally is a board game for small children to make fun of and is even used as a means to gamble.
I think teaching or not will come back later they will find out.
So, it's very unwise if parents don't make at least introductions or lessons about gambling and its effects