buffet, Dimon, jak ma and other big investors who have commented in bitcoin and cryptocurrency have the right to say what they want. As they study the economic and financial market for long time with their expertise in in financing and investment many of their statement affect the market as they have many followers (count me in). I don't believe that they don't have knowledge about bitcoin and cryptocurrency, bitcoin now is a big thing that recognize by many people around the world, i believe that these people are protecting their investment. But for me it is proper for them to say anything about bitcoin. In addition I watch a video that Jak Ma say that he don't know about bitcoin, but he is looking forward in the blockchain technology.