We already know that money has been used for illegal things such as money laundering or buying something illegal.
If every government can think that crypto and fiat are like a knife which has two sides, and we have a choice of how we will use for, I think they will understand and will try to prevent that thing.
It will difficult work to know for what reason crypto is used because we can only see the transaction in the blockchain.
Maybe they can still use their fiat, while they can legalize crypto to be used as a commodity at the market and make payments.
Every government needs to dig deeper into this to know the advantages and disadvantages of crypto.
I agree on this. Money laundering and other related illegal activities are always put into blame on cryptocurrencies knowing that more malicious and hideous activities are being done with the use of fiat currency. Both fiat and crypto have their own advantages and disadvantages depending upon the usage of a certain individual. Such activities must not put to a blame in any kind of currency for people are responsible for doing such acts and not crypto or fiat as a whole.
Regulations on using cryptocurrencies must be put into discussion knowing both sides of the pros and cons of it to be able to settle or set up a solution to resolve the hanging problem with regards to its usage. If that would just be the issue why Russia is still not allowing the usage of cryptocurrencies for payments, then they must settle regulations that will inhibit the usage of both crypto and fiat in a free space which will still assure that their national currency will not be taken for granted because of the existence of cryptocurrencies on hand. The government must gain more knowledge about cryptocurrencies and better do understand the importance of its existence as a payment option in their country.