I have recently mentioned it in another topic: in my country, on the contrary, there are regulations in force to protect the youngest, like a minimum distance between schools and the nearest casino, the mandatory identification in order to access, the prohibition of advertising them on billboards and bus shelters, and also of advertising them on TV before 1:00 AM. Even YouTubers have been warned and will be fined if minors are among their target and they advertise anything related to bets.
Therefore, I think it depends more on the culture/politics/government of each region.
In my country, inflation is very high, so people are trying to make money quickly. As a result, the number of people gambling has significantly increased in recent years. Consequently, gambling has rapidly spread among young people as well. I even see kids playing slot games on their mobile phones in the library, which is really sad. Although the measures you mentioned exist in my country, they haven't prevented young people from gambling. Despite age restrictions on websites and mobile games, everyone continues to gamble using their parents' identification information.
This is sad. But although these measures are not perfect, and maybe some of them can be interpreted as too lax by many or even as too strict by some, I think that they have some impact in children and teens in the sense that they help to decrease their gambling activity, to a certain degree. If that degree is 1% or 30% I can't tell, but I'm pro protecting minors, so no matter how little the impact is, I think it's good.