Just what can be done to ensure limited exposure of this kind?
There really isn't something that you can do to avoid them from being exposed to gambling as even mainstream content creators on various social media platforms promote them regardless if their target contents are for children as they are being paid well by these gambling platforms. The best thing to do as an adult will be to educate them instead.
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.
Certain governments don't really care about gambling and casino advertisements as they are one of biggest taxpayers and contributors on the economy of the country. The same goes for radio, TV, and social media influencers as they are being paid a ton to promote these platforms throughout their content and videos.
For me, the only thing we can do especially for our children will be to educate and inform them about the negative effects of gambling such as addiction and how to manage doing it responsibly as we cannot do anything if they decided to start gambling even without our consent.