In my country, the government also believes that Bitcoin is a gambling game and a means of getting rich quickly and that is why they stopped trading in Nigeria even with this it doesn't stop people who have been into it to sell off their coin or their investment.
Does the government really officially consider bitcoin a form of gambling? This is one of the biggest follies that a government may promote, so its citizens will be misled. Fortunately, Nigerian users do not take their government at their word and continue to use Bitcoin as a means of payment and as an investment.
In most countries that do not recognize Bitcoin, the pretext is that Bitcoin is a form of unrecognized money and therefore its use is prohibited. In other conclusions, the pretext is that it is a means of financing suspicious and criminal activities (terrorism).
Of course, these pretexts of various kinds prove the government's inability to control the uses of bitcoin due to the decentralized properties of the blockchain.