If children have access to TV and the internet without limitation, they'll likely come across these gambling advertisements. Nowadays, with plenty of sources of entertainment online, it's too risky for our children to give them full freedom. It's still up to us how to discipline them and provide only what is necessary at their young age. We want our kids to have the same interests as us, if we love sports, we might also want them to enjoy sports. However, gambling is just quite different. This thing is what we call for adults only or mature content, similar to porn shows, with a warning: not for kids.
As a parent, it's hour responsibility to know what's good for your kid and what will negatively affect them, it's better as a parent to know the parental guide on your TV. If you notice there are some channels that has +18 content, it's better you block them or simply used a pin code to locked these channels so that when you are not around and they want to open these channels, it will not show or it will request for the pin you used and since they know them, it will be difficult for them to access.
You can also just subscribed for package that has children views like the carton and other baby things that doesn'take children learn adult lifestyle, it will help them not just in their life but also help them focus on school because they you can easily block everything so they can focus on what's important in that particular time. As a parent of 21st century, you need to be smart ahead of these kids because they will do what you don't expect from them.