Change Your Mind About Bitcoin

Many people express different types of bitcoin. Someone says Bitcoin is not a currency. Again someone says that Bitcoin is only a bubble, it will never be universally recognized. Some countries have banned Bitcoins so that illegal activities will not be increased in the country. Because some of time bitcoin use for terror works.Some people say that investment in bitcoin is not profitable. There are some other such complaints about Bitcoin.
Really, people’s complaints about Bitcoin are correct?