There is a difference between Banning religions and Loosing tax examption status.
I think there are possibility WT loosing regal status as religious corporation at least some countries for Shunning policy.
I came across a WT article which admited the shunning practice was to play a role of blackmail
to prompt family member to back to a religion. Yes, WT admits they use blackmails.
Japan for example, religious corporation sould not be contrary to the public interest to
gain tax examption status.