I believe that such things have restrictions, you can filter out the things you don't want to be displayed on your tv when you are with your kids. At their tender age it's good to protect them from such things, when they get older they might probably learn it from either peers or just curiosity. Even though they end up learning about gambling when they are above 18 it won't be as bad as when they start doing it from a tender age
I'm not sure if it's possible to restrict ads on TV, reason is that ads comes with TV advertisements and the only way to stop gambling ads is to completely turn off the TV station from sports related shows. There is a way you can set a parental guide on TV stations that have sports ads. You can restrict them so that they don't see the particular tvs and even if they try to, it will ask them for password to access those TV stations, that's the only way to stop them.
Parents are the only person that can control the way children get addicted to their TV and smart phones. I don't think there is any place on the internet you don't see ads. Ordinary Google personalized ads for people to see so they can make money, it's literally what is the standard of the telecommunications company, it's your own responsibility to choose to see them or not allow them to show on your screen especially the annoying casinos that don't know when to stop.