These should be reason enough to treat them with caution. We have also seen that cryptocurrencies are not amenable to definition as a currency, asset or commodity; they have no underlying cash flows, they have no intrinsic value; that they are akin to Ponzi Schemes, and may even be worse. These should be reason enough to keep them away from the formal financial system.
However, there are also some conceptual issues associated with this idea, mainly because insurance liabilities are different in nature from insurance assets and often do not have an accessible market. Nevertheless, it is important to find a method defining a discount rate that would be consistent from a financial stability perspective.