Rules and regulations implemented by thd state is the external factor that can affects the financial performance of Bitcoin.
It is a inevitable event that once implemented all things will be affected. I think every decision by the government really affects and its so much means to the company's performance in the industry.
of course very harmful for us as working in bitcoin is actually a country that provides rules / prohibitions to bitcoin should the country make it easier for people to work anywhere on any site in order to reduce unemployment.