Interesting, using the under-age argument to ban these ads generally - guessing this is how smoking ads where banned - seems like a good technical way to ban them generally to the overall population.

And even if we look just at under-age audiences, a ban for them make sense, since that for a decent-sized portion of teenage boys, sports is an obsession. Having them pummeled by sports-betting ads at an age when they are often exploring new things is probably not a good idea, as it will make betting (and for some of these, betting addiction) a part of their lives while they are young.