Everyone is different but, in my own personal experience, there were numerous unofficial "interventions." They usually consisted of being caught (again). At the moment I was being confronted, yeah, I would feel remorseful, humiliated, wonder what's wrong with me, promise to get help some way or other, etc. I would even mean it...in that moment. But later, resentment would settle in again, followed by the old familiar compulsion to drink. I would just vow to get better at hiding it. I don't know any stats for how well interventions work in general. I just know, for me, they never did. Unless you count what happened to finally get my attention as an intervention.