In 2019, United Kingdom implemented a whistle to whistle ban on gambling advertising. Basically no gambling ads can be shown 5 minutes and 5 minutes after a sporting event to avoid kids and or other vulnerable people to see gambling ads when watching a big sporting match. As a gambler, what would you have felt about this? Especially if you were betting on the very same sporting match? Do you think that this was effective in reducing gambling rate in the country?
What does the fact that you have money on the game have to do with advertising of the game? You already have your bet placed so you are aware of the game, no need to pull you in so to speak.
As far as reducing the amount of people interested in gambling, it's gonna do nothing.