Bitcoin regularly comes down for various reasons. One of those reasons is the FUD, which makes people fear and sell their coins quickly and very cheaply, another reason in this case has been Elon Musk's tweets saying that Tesla was not going to accept Bitcoin as a payment method, and another reason is the news that China is going to ban (this is the seventh time in eight years) Bitcoin. For better or worse, this is not the first time these things have happened, and Bitcoin and the rest of the market have managed to rebound.