It's not just today, bitcoin price has fallen more than 50% since December after it reach $20,000.
A big correction due to blockchain can't afford too many transactions per second which cause huge backlog on mempool.
Another reason is some negatives news from Asia, especially in South Korea, a country that has great trading volume, people panic sell after a news indicate crypto trading will be banned.
However, I'm not agree regarding bitcoin called scam and bitcoin cash is the real bitcoin.
It's not the right of a US government institute to claim such thing, bitcoin users deserve to say whether bitcoin or bitcoin cash is the real bitcoin. We know it better than the US institution.