I think its not, because bitcoin is no central control so its hard for government to regulate the system. Maybe because there are market manipulation or in the blockchain as we know the fact that the value is depend on the supply and demand or let say that bitcoin rivals has buy a large amount of bitcoin so making it price going high last past few months and now they are selling them all that causes the abrupt falling down of bitcoin value and the effect is there is a panic selling and all big investors are now afraid to invest for bitcoin.