Bitcoin can not be banned because the bitcoin network is made up of 7000 nodes. These 7000 nodes are in many countries, thus if someone shuts down some of these nodes , the other nodes remain.
This is why the bitcoin can not be banned. A country can disconnect from the internet, but this would not ban (interdict) the bitcoin in that country. There are internet satellites, there are many possibilities to connect to the internet from a country that has disconnected itself from this.

One can shut down the internet on a country, but that country citizens can go to their friends and connect to the internet from there.
A country does not have one ISP,  every country has many ISPs and every of these ISPs has its connection the internet.

A country government can say whatever, can do whatever, it can not interdict the bitcoin because simply I can go to another country or connect to the internet through another ISP.