Some countries do not like the bitcoin as it can destroy their own economy due to that they do not want it in their own country..
Bitcoin cannot destroy the economy, since bitcoin is money then it is the opposite, bitcoin was created to help the economy to flourish by offering a new version of money that is the most practical yet devised by humans what it can do is to limit the power of governments.
Limiting the power of governments on controlling their own economy because of bitcoin is becoming their primary currency is indirectly destroying the economy. If bitcoin becoming just 2nd option or an alternative currency then it's definitely fine but different if bitcoin is really dominating the whole economy of a country and government can't do anything, there might be many criminalities occur due to this case and probably people will take advantages of each other