Not been involved personally and it contains no feedback but there is a description of a CCBT course of treatment for gambling disorders below CWG.
The system employs some telephone counselling at certain junctures to review progress I understand.
I'm not for or against it particularly and have similar thoughts about CBT in general as yourself. I've heard anecdotally of a few positive outcomes and reviews via a couple of IAPT counsellors I know.
I suppose the slight cynic in me senses a whiff of money-saving about it but I wouldn't want to dismiss it either. I find that most of my clients have too many complex needs to make a CCBT course apt for them.
https://www.gamcare.org.uk/get-suppo...ine-treatment/