Yes I agree with you, the government of any country can try to ban or heavily regulate the use of Bitcoin within its borders. However, major countries are trying to completely eliminate the use of Bitcoin but making it extremely difficult for governments. In countries where bitcoin is currently used, it continues to be used through mechanisms such as peer-to-peer exchanges despite government restrictions. Anyone can access and use Bitcoin from anywhere in the world. This makes it challenging for any single government to stop using Bitcoin.
There are no "major countries" trying to ban Bitcoin or otherwise, "completely eliminate the use of Bitcoin". That's nonsense.
Bitcoin is legal to hold and trade in almost every country in the world.
Spreading this disinformation drives the price of Bitcoin downward. Please stop.
The government has the full power to stop Bitcoin and it may not exist again if the world government comes together to ban Bitcoin and eradicate all that it is all about, they would do it but this will be very difficult because not all country will agree with that and it could bring a state to contention. We don't pray that this will happen because even the United States have accepted Bitcoin and it shows that things are going to go smoothly and the adoption is going to continue as more people get to know about Bitcoin. It is better we starts buying before the full adoption will take place that will increase the numbers of holders to skyrocket.