You have to understand that the regulation is provincial. The NCSBN promotes its exam a great deal, not only in Canada. It tries to sell it throughout the world. Up till now, only the other Canadian provinces have purchased the exam. I believe Australia may buy it as well. They attempted to sell the exam in Quebec. Quebec representatives went to the United States, they looked at the exam, and they decided not to buy it,because they felt that Quebec needed to control its own training.
On May 9th, 2017. See this statement in context.