Hello
it seem that those dumping prices are affected due to short orders of brokers which are using bitcoin and a financial instrument to make money, instead of its ideology of holding/ capital investment.
due to those bitcoin futures, there arent any " limited" bitcoins nomore, and those brokers or citiziens ( whom can contact brokers to buy them those futures ) , as they can buy them at its present value without using any wallet or register to annoying exchange platforms with tons of aml/kyc laws.
i think those 2 things are destorying the bitcoin as banks are also possible to go shorts via the bitcoin futures without having a problem with the regulations as its a stock market.