No. The majority of them today did not as they were born in and baptized while they were minors, some as young as 8 years old.
Then their parents are to be blamed for the indoctrination. They took their child to the baptism pool.
And these children who continued going to meetings after they turned 18, proved that they still agreed with the WT rules. (One of these 8 year old made their way to the current Governing Body) They can leave anytime. Agreed that they will be shunned, but freedom from a cult has its own consequences.
A person can walk away from his cultic past and have a successful life. If he has lots of money, time and willingness to accept defeat, he can sue the WT.