maybe some countries think bitcoin is a payment tool that will replace fiat, because satoshi made Bitcoin / cryptocurrency might be created to aim at creating a digital payment instrument, in an era where technological advances are growing, and why some consider bitcoin is one of the best investments because, it can only done online, whereas if fiat was created for real payment,
So many people are in demand to use bitcoin as a payment system in the future and those countries are getting threatened caused by this thing. i think the satoshi's vision is not only created the payemnt instrument but the freedom to our financial to leave the centralized system that gives a lot of limitation for us to control our money. Remember some are still seeing bitcoin as commodity too.
But the possibility to replace fiat is only a small percentage caused by it has backed by the regulators and financial institution. Im aware about the regulation is the main thing that still becomes the opposite thing to the crypto.