I know the corona virus affected the price of bitcointhat led many people to sell out at that time but I doubt coronavirus occured just because of bitcoin. The existence of corona virus have nothing to do with bitcoin, their might be something the caused the virus to occur but bitcoin was not the target, this deadly disease caused ao many effects on important things that is very valuable to human life. It also affected the economy in general.
Many articles suggest the virus originated from China but irrespective of where it comes out from, just know that the virus was a biological weapon set to wipe out the population of the world, it could also be a weapon for shock market to crash and it did, even oil was so red that year and speculative even when no news was there, a lot of people sold their investment because of food during the lock down and you know, during war investment doesn't matter, what matter is food, water and means of survival.
Bitcoin wasn't the only asset that crash that time but it hurt the crypto market more because a lot of people were bullish on the coming halving which was great but the the volatility of Bitcoin is crazy, the volatility was one of th reason why Bitcoin crash was high than the stock market but the recovery was crazy. A lot of people made money after the halving.