Cryptocurrencies are only ALLOWED to exist, by governments, as long as they FAIL to fulfill their original promise: to sidestep tax, monetary policy and regulation.

Once there is any risk of them succeeding, there is an imperative to shut them down.

https://www.reuters.com/article/us-facebook-cryptocurrency-france-german/france-and-germany-agree-to-block-facebooks-libra-idUSKCN1VY1XU