Hi there Bitcall! There are so many people with ordinary status, businessman, traders, CEO, popular investors, professors and others that always note that the bitcoin is huge bubble. Even you compare the tulip and internet bubble in terms of price rate and how it reach its top you can definitely see similar phenomenon, bitcoin even surpasses the price increase of those two bubble. If you are asking about the risk, it is more risky than the previous bubbles. However, what makes bitcoin differ is the huge and robust capability it can do that make it more like a necessity in this technological era.