The way we cant only prevent the children from having encounter with gambling ads, same applies to other forms of ads because they are appearing on all social media apps and even in physical, so we cant completely avoid coming across ads in general, but we can decide not to watch or click them, because we have access to our freedom in making decisions, we can also see from the way they have been promoted by some prominent citizens in the society, which is a source of income to some as they advertised on it on any platform.
When was the last time you saw kid showing interest to gambling and gambling? Kids will be interested in gambling, not after seeing gambling ads in the internet of offline, but if streamer or blogger they watch all the time start advertising it. I am not sure if ads even work on kids, except if it is a toy shown. Imho from gambling ads kid only learn annoying jingle. I dont see gambling ads as a big danger for kids. Its a problem for adults only, because they earn money and can repeat gambling process again and again.