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Why would a former alcoholic person would go to a bar if he's trying to get rid of his alcohol problems, that same person will of course be exposed again and get himself back to zero after all that hard work he or she put into just to hold his/desires. The situation is not the same with an addicted gambler because every move you make even if it's just watching sports, you will be tempt because of the advertisement about the betting sites and its odds.
In a normal life lots of people go out and socialize at bars, so if the ex alcoholic wants to meet with some friends then he might end up in a bar.
Also any social occasions like weddings, parties, etc, might have alcohol available, so it's up to the ex alcoholic to not drink.
It's the same with the gambler, it's almost impossible to not have external factors showing you gambling stuff, it's up to the gambler to decide not to gamble, even though the person is exposed to it.