What I take from the non's is that in their family and among their friends it ends for those people. When your a witness your job is to proselytize for the WTBTS......... nothing easier to 'encourage' family and friends to become a JW..........but when you become a non believer that activity ends.
With the internet available for most people and no family connection very few are enthusiastic about the message from the WT.
Growth can come from a born-in or a crazy person without them their is little to no ministry. Just leaving a track in the door does nothing.
Other then the lone shill who is more likely to be an accomplice of a swindler who acts as an enthusiastic believer to entice or encourage others to join up.
Once someone catches on....... they are gone.