BTC being a global currency in cryptocurrency is real, but not for the world. because what I see if it becomes the world's global currency it will be difficult because now not all countries approve of bitcoin and recognize bitcoin as one of the global currencies
The world is an ocean full of kings with powers that rule different lands, a small boat like bitcoin when it wants to cross such borders, it needs to prove it from many angles, from a legal perspective to being useful and not causing side effects for users, there are many small doors and regulations to go through, it's not easy to become a standard that circulates around the world. Failing to fulfill such roles, attempting to cross sensitive borders, is easy to become targeted and asked to be removed.