Some countries banned crypto assets totally, some banned mining, some allows even paying taxes with it and some doesn't allow purchasing goods using crypto assets.
Those countries that ban cryptocurrency from my understanding their not enlighten via cryptocurrency, it's obvious that cryptocurrency can help to speed up economy of country if well proper planned but from aspect of some government understanding they are seeing cryptocurrency more especially bitcoin like a currency that is going to subdue they are currency, and also seeing Crypto like something that is against government policy, i over heard some person's saying that government can bad crypto, the answer there is no, they can only restrict cryptocurrency.