I like your point here, they have to determine from their heart to change if not everything will results into wasted efforts if care is not taken, there's a stage an addiction will get to and go beyond control except if the person involved willingly determined to change but it would have been too late i most cases because they would have been seriously dealt with and left with no other alternative to live than quitting.
It's not that those addicts don't want to recover from their addiction but it's what's known as "relapse".
After rehabilitation, some if not most
adficts have a tendency to get back to their previous habits (addiction).
Rehabilitation takes time and full recovery from addiction needs a strong will and strong personality from the addict himself. Yet, there will be always a possibility for relapse.
The exact idea of rehab is to regain back the normal mindset of a person to bring back the balance in him, but once he start playing back at his will, that rehab will be pointless and it will create more problem to the person, it's the own will that needed as after the rehab a gambler should never look to this venue even just for fun or anything.
As he always has that chance to be addicted again and it will trigger that lust to keep playing over and over again.
Going on rehab or having that professional seek of help is something that not necessary because you could eventually quit on your own if you are really that meant on doing so.