You have not checked the site and you make conclusion. I only read the introductory path which has no complete information and I may not be exactly be correct either. The introductory path does not talk about quitting though.
I have not gone through the entire site details, but I made a quick preview of how to stop
gambling addiction from the link provided in the OP.
People that want people to quit addiction want addicted people to stop doing that thing that makes them addicted, like to stop smoking or gambling. It is better to stop than to continue to be addicted.
Too much of everything is bad, but being in control of whatever you are doing keeps you on the right track, and no one will criticise you for that. Unless those who have already made up their minds see such activity as bad, there is no point in stopping gambling.
If you can learn how to come out of the addiction page, then there is no problem with continuing to gamble. That's only if you are sure you can't go back there. The main reason why people are advised to leave whatever they get addicted to entirely is because there is no guarantee that, at the end of the day, they won't get addicted again.
There are things you really can't help yourself with unless you stop coming eye to eye in contact with that thing, I have my addictions too and it's not about gambling or money, it is food and taking too much do hurt me in the end but since I can't control myself I need to rescue myself, the only thing that worked for me is avoiding the food, I can't control myself to eat a little part and do the same another day.
I think this is what smokers are facing too, once they decide to go closer to someone who smokes they will end up going back to been a smoker, with addiction I believe there is no such thing as been in control while still participating in that thing, you either quit it or you surrender to it.
To stop been a gambling addict you have to stop gambling, I quit understand what OP is saying, to gamble responsible belongs to those that are half way to becoming as addicted gambler as they can still get their heads clear and do the right things, but for those that are already too addicted to gambling it's going to be hard for them to become a responsible gambler, they as better off staying away from gambling.