The real value is only in the USD and NGN. Using Bitcoin to move the value is only propped by hype-fueled insanity that doesn't need to exist. International banks could easily create an international money-transfer system that would be far more reliable and secure than any decentralized Ponzi scheme. An in fact, such systems do exist - for example I used to earn in USD and spend instantly in other countries using international Visa/Mastercards like Revolut or Wise.