If you come to my country, in my state, my town, you will see big sign boards advertising gambling sites. From this you will understand that the government does not care.
On TVs, YouTubers and everywhere you will see gambling site advertisements.
What will betting agents do if someone send under 18 to place bet for him in such town like mine? There is nothing that can be done in countries like mine than to teach your children the right and the wrong. Let them know the pros and cons of gambling and how bad a gambling addicted person can be.
It's quite painful now that the society doesn't caution teenagers not above the age of 18 that gambles, if you walk into bet centers in my country you'd see kids actively involved in gambling more than even the adults. The government has failed to regulate this and also the bet companies only care about making profit so they don't put measures in place to restrict these minors. Like you said gambling adverts are everywhere and this has become a serious problem for these teenagers, they make use of the internet on a daily basis and they come across these gambling adverts, young people are gullible, they would believe anything they see on the media and in my opinion this is what makes it toxic.