Bitcoin is not meant to break the economy of any country but rather to help raise the economic status of a country as it gives the people financial freedom and independence. This financial freedom and independence is made possible through the decentralized nature of Bitcoin which grants the users the total control over their own transactions without any third party interruptions.
In my opinion, Bitcoin was created as a peer to peer payment tool based on network transparency so it is difficult to manipulate. If Bitcoin is used as a payment tool, I don't think it will disrupt the economy because a country must have its own currency and Bitcoin is only a complement to this digital age.
I disagree to this, if we used it as mode of payment the government will not get any data out of it, our GDP and GNP will not be affected if there's a massive use of cryptocurrency as mode of payment, I think if they regulate it then the cryptocurrency will not do any harm to the economy, but it will defeats the purpose of the bitcoin which is decentralization.