Because Banks in Britain and the United States have banned the purchase of cryptocurrency by credit card. This is bad news makes bitcoin and cryptocurrency market are going down. 
It's nothing to do with that. Most people don't buy bitcoin with credit cards. They wire cash to teh exchanges.
No, what we're seeing is plain profit taking. You can see the same on the stock markets. The US economy is overheating and interest rates are going to rise. That makes cash savings more attractive, and less risky.
Yes, I kinda agree with you on that, and credit card debt is going to be more expensive with the interest rates that might go
up, so people might be more hesitant to use credit to fund their Bitcoin investments. When the US economy struggle, the
rest of the world, feel the pinch too. A lot of people might even be liquidating their savings in Bitcoin to pay off their debt,
before the interest rates goes up.
