People who leave, become 'inactive', but at some point come back, really never left. Sure, they didn't go to meetings, or go out in service, or attend the conventions, but the prior mind control was still there in some small way. Enough so that when things in life took a turn that caused them to question either themselves or the world they live in, they came back.
A friend of mine, DFd, has been away for decades. Lived his life away from any JW contact, not attended any meetings for years and years. He has not lived an exemplary lifestyle in this time, but he does attempt to avoid holidays, politics, and supports the blood transfusion ban.
At one point, I thought he might be finally freeing his mind of the JW mess, but he told that he thinks the JWs are right. He's just not strong enough, worthy enough to join back. So this guy is living his entire life with a guilt complex that he's not good enough for a religious cult.
He may never go back and be an active member, but the WTS controls him every bit as much as they control the active JWs.
If that's not a cult, I don't know what is