It is right that Bitcoin market has some what affected by the words of Elon Musk. This situation may temporarily break the discipline of the bitcoin market but I think it can't decrease the importance of Bitcoin. Now the question is manipulation. Who is responsible for manipulation? I say, the investors are mostly responsible. The investors should be more practical and should have proper knowledge about market. Why the investors sell and buy depending on the words of Elon Musk. They should act on the basis of the market, not on the words of Elon Musk.