Actually, there are many reasons why bitcoin price affected. On my opinion, is that those big whales could affected since they have a huge amount of shares of bitcoin as the time they will cash out bitcoin fluctuates tremendously. Also, those small amount of shares may feel panic and sell their shares as they dont want to loss too much. Well, this kind of situation is just a supply and demand in times of ups and down of value but I believe soon in the future the value of bitcoin will sky rocket as the performance of last year.