Some economic observer will consider bitcoin as a threat to a country economy. I am not sure about that because personally I as a bitcoin user can feel the benefit such as profit through investment and trade. But they also have their own view, as long as it doesnt bother us so let them talk.
I guess that is because of the anonimity it offers.
We doesn't pay taxes to our cryptocurrencies or the profits we are having, I guess that is the reason why they look at it as a threat. If more people would be using it, then more people would be able to evade taxes earned from it. Still, I agree since there are still a lot of convinience of it but I think it is not majorly for the economy of the country.