One of their most used tricks to maintain people controlled and to keep ex-JWs feeling like crap, was to isolating and limiting access to both information about doctrine and about the lives of people who leave.
The Internet has posed a giant challenge to the WT in that sense. Aside from people having easier access to information regarding all the nonsense that they teach, the thing that has hurt them the most is ex-JWs being able to unite, compare notes, form groups, and provide a consistent message about what the WT really is.
Without the Internet (for example), many people would have never heard about the case of the Australian Royal Commission and their institutional child abuse. More than finding discrepancies in their teachings, the Internet has provided a more realistic picture of who they are.
Also, people who may be thinking on joining them have the opportunity of hearing the entire story before making a decision.
At first they tried to stop people from using the Internet, then they started talking about the "dangers of the Internet". It was inevitable that they had to embrace it, but they came in late to the game. That is the result of having older non-technology oriented people in their GB.
So yes, the Internet is one of the WT's biggest nightmares. Still is.