It's not a 1:1 comparison. For one thing, the regulations are different. There are few if any restrictions on online gambling advertising, whereas alcohol ads are disallowed from using imagery that might appeal to children, can only be run in places where at least 70% of viewers are adult, etc.

But more importantly, the nature of the product and the intent of the creators is different. Alcohol vendors for the most part don't want people to get addicted to alcohol, and most of their revenue doesn't come from addicts (90% of American adults drink at least socially).

Gambling, and gambling advertisements, are deliberately designed to hook people to it as an addiction. Only 25% of Americans regularly gamble, and just 2% of gamblers produce 50% of industry revenue.