If the gambling was legal one in your country,you can watch the game in various places including the television.Most of the time the gamblers able to watch the advertisements in the YouTube and the application used in their play store.Because the gambling advertising was allowed in your country because of the funds given to the country by the way of taxes.The small country will try to illegal the gambling,because they don’t want to cut their economy in the way of the money spreads in the gambling site.Instead the gamblers can do the gambling in their own gambling site by skipping the play of the gambling in the other application front the other countries.
Even countries where gambling is legal should ban ads on TV because it's not unknown by the authorities that kids watch TV as well, and this thing can have a pretty bad influence on them if they see those gambling and casino advertisements. I believe some countries such as Australia have taken such steps and have banned gambling advertisements both on TV and online spaces which are social media and other locations on the internet.
In countries where gambling is already illegal, TV channels don't allow casino or gambling-related advertisements and you won't even see such ads online unless you search a lot about them and then get targeted ads based on advertisement algorithms of Google and other ads services.