However, banning it with the part that stopping and not allowing people to accept it and use it as a payment method is the thing to consider. You may have a bunch of bitcoin. But what would be the sense of it if the government already issued a law for the people not to accept it and not to consider the value of it? The government has the power to stop people from using it and consider it as an illegal deed.
So? Who cares if the government considers it as an illegal deed? Not everyone cares what the government think. If that were the case, no one would download torrents and no one would visit the dark web.
For example, the Indian government banned crypto exchanges completely, but Indians execute Bitcoin related transactions regularly through P2P platforms like LocalBitcoins.
Once the government bans bitcoin, most people cares about it. Those who do not care about the bans are those who do not afraid to be punished or getting sanction from the government. It is true that there is always a way to access it although it is banned, I my self wont care about it too much but I'll be more careful.