A cult that practices shunning of former members and refusal of blood transfusions. They feel free to preach endlessly to you, but will not read anything you provide them on alternative opinions believing it to be originating from Satan.
Jehovah's Witnesses are not allowed to speak to former members, even if they are family. Some chose to leave, others may have been disfellowshipped, a form of excommunication.
If you were once a JW and now have learned new information, how can you enlighten current JWs if they are not allowed to talk to you. That is why they are a cult.