Overall we can tell now a days cryptocurrency is big Fact for global economy. So it is proved that cryptocurrency affecting on global economy there has no doubt.
If I say bitcoin is increasingly popular because people have more and more needs to invest and make money online, I agree. But to say it has an impact on the economy of the country or the world is an exaggeration, and there is no proof for that. Almost everywhere sees bitcoin or cryptocurrencies as a financial market, mainly for speculation without any intrinsic value. How could it affect the world economy? Considering its capitalization is even smaller than that of a company like Google, so its impact is negligible. They only bring benefits and influence at the individual level, but it is nothing for the global economy.