My wife and Domme is a former Witness, born into it and raised as one. I've had that conversation with her. It's a very male-dominated religious group, with no room for independence from females. So as a woman, she left home at an early age (16) and has zero interest in them. They chased her for years to try to get her back. Her parents are still in and have cut off contact. Similar to Scientologists, Witness's cut off those who leave the religion. I wouldn't be surprised to hear of male Witnesses having submissive fantasies. However a man would never be able to reveal those thoughts or let them be known to others in the Temple. It's complicated, but he would have to eventually leave that society to live as he wanted to.
When I read the thread title I first thought that it was about perhaps revealing male Chastity or femdom position to a Jehova’s Witness who invades one’s privacy by knocking on the door to discuss religion.