for example, a few weeks ago, authorities in China were reportedly planning to block domestic access to Chinese and foreign virtual currency platforms that allowed trade to be centralized.
Apparently, investors are monitoring the warnings from a number of regulators and the increasing crackdowns on the virtual currency market in China.
of course issues and news like this contribute to the fall of bitcoin values today.
Its called FUD and that's the main factor of any downfall on cryptocurrency. I heard Whales are also the one who is/can control the price of BTC, but I find it hard to believe because there's no such proof of this.