I am just throwing this in the mix.
Back in the day, when a large percentage of members left (1925'ish I believe), the organization had some different policies in place that actually made that easier to do.
A big policydifference was - Disfellowshipping (shunning) was not a formal doctrine or practice of the religion.
So the medieval social/psychological trap was not in place yet in the cult. You might could even argue it wasn't a cult yet.
Translation: Members obviously felt they could air grievances to each other and subsequently take whatever personal action they needed to. This led to activist groups forming and leaving.
Today this is not allowed. Today is is a full blown nasty-ass cult. You complain - you are quickly kicked out and the remaining members are not allowed to speak to you. This actually happens too. It is not just on paper. Look up jwstruggle on youtube and you can watch these confrontations and trials led by congregation elders.
It is a sick complicated mess.
I personally wish for governments to step in and enforce The Universal Declaration of Human Rights which includes as Article 18:
- Everyone has the right to freedom of thought, conscience and religion; this right includes freedom to change his religion or belief, and freedom, either alone or in community with others and in public or private, to manifest his religion or belief in teaching, practice, worship and observance.