5 reasons Bitcoin and Ethereum plummeted 15% in a single day

Bitcoin and Ether fell 15% and 20%, respectively, in one day — but why so much and so quickly?
Source: 5 reasons Bitcoin and Ethereum plummeted 15% in a single day (https://cointelegraph.com/news/5-reasons-bitcoin-and-ethereum-plummeted-15-in-a-single-day)
Would appreciate your opinion about this