An interesting quiz question I've observed in every market correlation the rate of FUD increase and most investors/traders panic and sell out their holdings which also increases the market to further dip.

Before any dump will occur in the market there are some certain FUD that causes panic sell which leads to price dump regulations from some countries like China and FED news

The above graph gives a summary of the price dump in 2017.

Below is also price summary of Bitcoin from Jan to Dec 2017 and that for 2021