Thank God people are starting to notice on stuff like this because this is a big deal, if children and/or teens are getting into gambling because they see it as normal, we'd be seeing an epidemic of future adult gamblers that are going to be addicted to gambling, I think that parents should be educated right now about this and that it's alright to be strict or heavy handed when it comes to gambling, we all know that it's going to be a bad time for them in the future so why not try to stop them now and tell them what they might end up in the future if they continue gambling, maybe having a monitor for your child's online activity might be the best option even though it violates their privacy.
If the teens are still under their parent's care, parents I think should have the right to know what their kids are doing online and on their phones. Whether privacy is an issue or not, my teenager will definitely be under martial law and I will check their apps and browsing history.
Teens are yet not fully aware of what they are doing just as Colby Cotrone said, they are fans of the sport but they are crossing the line already when they gamble. Government agencies may step in if it becomes an epidemic already. Australian government AFAIK is doing lots of things to prevent their citizen from gambling including banning ads everywhere.