There is no doubt that everything that the government cannot control is a threat to them.
Uncontrolled Finance is a threat to the economy and to the indicators of gross domestic product.
The profit gained from cryptocurrencies is a concealment from taxes, which entails holes in the country's budget. Of course, any government will do everything possible to get rid of what they consider a threat.
But this is already a running mechanism. And of course no one wants to say openly - I am rich, but do not pay taxes. It's a prison and confiscation of property.