Going through some countries economic performance and statistics I came to a big conclusion that the economic benefit bitcoin as an approved currency in a country is way more than the disadvantages of Bitcoin to an economy but what the government in scared is the decentralization of the financial system.
I think that making such conclusions requires a lot of research and cannot be determined immediately (unless someone already did the research and one can simply refer to it). A quick search shows that such research hasn't really been conducted. So now to the reasons why it's not so simple to determine the answer right away:1. There are countries that do well economically even though they aren't really into Bitcoin (like China).
2. What counts as approving a currency? It is only legal tender, or is it regulating it in any way? The US is doing well, and cryptos are legal there, but the legislation isn't crypto-friendly, considering the sell tax.
3. If a country is doing well and it's Bitcoin friendly, it doesn't mean that there's a causal relationship between the two. Switzerland is considered crypto-friendly, and it is doing well economically, but are these two really connected? Probably not, since Switzerland has been an economically strong country for a while, well before Bitcoin.
