Nowadays, there are many countries forbidding bitcoins because they are afraid of illicit money and can not control it. Five countries banned bitcoin like China, Bolivia, Vietnam, Ecuador, India. I personally think bitcoin is very useful for people's lives and is a long-term and stable investment.
yes bitcoin is usefull but some people use it negatively that's way scammers create difficulties for the real investors. and their country afraid from illegal use of bitcoin.
The state itself, the government itself can not control bitcoin. They don't like anything they can't control. So the scammers had nothing to do with it. The blockchain will make all government Affairs are transparent, but they don't need.