The ads are everywhere and are difficult to control, If you tell them lies for the one you all see on TV, you will not always be with them on their mobile phones, and as they walk the streets. There is no need to tell lies to your kids because they will later find out the truth and may become disappointed in you.
When you start to lie to them, then you are compromising everything for yourself. You will always look for lies, which you will always use to cover up what you told them before, so I don't know how long you will keep on hiding the truth from them, because I am sure they will still end up finding out what gambling is all about. They can just search on Google and get all the information they need. They might be deceived and motivated to gamble by the information they see on Google and some advertisements they see on social media that say people are making money through gambling. But if you open up to them and tell them what gambling is really all about, tell them to avoid gambling, or ask them to avoid gambling addiction, It's better to just be open to them because children can learn to gamble anywhere, and if they don't have proper orientation, they might end up addicted to gambling, which is really bad.
Unfortunately in my country it is very illegal so gambling advertisements like that will not be found even though for example gambling advertisements are legal and often shown on TV maybe if you ask me what the advertisement is I will definitely answer and explain to my child that gambling is not very good and so on. because if we forbid it, it will really make him curious and find out about it. so just explain if he asks
If you are in a country where gambling is illegal, then any TV channel that can advertise any gambling site might end up being sanctioned for that, so no TV channel will even take that risk no matter the amount that they will be paid. But in countries where gambling is legal, you will see gambling site advertising on different TV channels, you will see gambling site advertisements even on the street. So you can't hide anything from your kid for a long period of time, it's better to open up to them and warn them.