Governments can't really prohibit the use of cryptocurrencies because "using" them is no different than sending messages through the Internet. If you have the freedom to express your opinion with verbal tools, you should also have a right to express your thoughts through electronic means. Money is a language with which to communicate prices and values of different things. Fiat currency is considered to be the "official" language of the country, but cryptocurrencies are a way to say the same using other letters and sounds; the meaning of the message remains exactly the same. You shouldn't be beaten just for speaking the unofficial language; you should be allowed to express your opinion using whatever means you see fit; if this is not the case, then you live in a totalitarian country with a government that respects neither the citizens nor their natural rights.
Bitcoin and fiat cannot be compared with languages, they are so much different.
You are free to speak any language, but you have a limitation to using Bitcoin or Altcoins. In my country, if you use Bitcoin or any crypto coins as payment tools, you will be jailed. Every country has different laws or regulations, we can't generalize them. You may be free to use Bitcoin in America but you can't do the same in a certain country like Indonesia (my country). Here, you only can use it as a digital asset, you can't use it for payment purposes. So, it is clear that languages and Bitcoin/crypto coins are very very different. We cannot determine the use of Bitcoin/crypto coins based on the use of languages.