So in practice our active use of macroprudential policy pertains only to LVRs. In addition to its financial stability role, the Reserve Bank also has responsibility for price stability. Macroprudential policy and monetary policy are set for different objectives, but they do interact.
In addition, the high volatility of their exchange rates to official currencies renders cryptocurrency useless as a store of value even for short-time purposes, let alone for the purpose of being a longerterm savings instrument. Finally, both the low level of acceptance and the high volatility of their exchange rates and thus purchasing power make them unsuitable as a unit of account.