Yes, they will still send you updates and promotions which will only tempt you to try betting again. So it's better if you'll unsubscribe from their promotions or might as well change email and mobile number for you to totally eliminate your contacts with gambling contacts which I think is helpful. Stay away from anything that will attract you to gamble again.
But gambling ads can be found easily now since they're already promote their casino widely, even you didn't even search that. Like how you're visiting a site about cooking or something, you will see a gambling ads. If you're watching a popular youtuber, you still see a gambling ads since he's promoting the casino. Watching a sports as example, you will see a casino name as a sponsor, it's too many and hard to avoid.
Gambling advertisements are indeed difficult to avoid because they have become widespread on the internet and have been everywhere I often see gambling advertisements as promotions they do to attract new users.
Seeing ads can't be avoided as long as we never click on them or access them. If you don't want to have an effect, just skip the ad and I'm sure you won't be tempted by any ads on social media.
Watching sports is indeed mostly sponsored by gambling, so that there are more advertisements that will not be missed every corner there must be advertisements there, but I think it comes back to each of us how we can resist if we don't want to be addicted.