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With so many providers for advertising like AdSense you mention, this can provide revenue for the casino or website that advertises to be directed to that casino. If it can get clicks from visitors and visitors play in the casino, that means the casino can earn revenue. But indeed children in this era are smarter than their parents so they can use the internet well, even without parental guidance. This is a dilemma for parents.
That's the purpose of Adsense and the same goes for any other advertising technique. But the problem is that it won't filter and it won't know how old the visitors are.
It is the reason why it is very possible for a teen to land and pay a visit to a casino because of these Adsense and its algorithm depending on the conversation they have and browsing history.