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In the USA? But it's been taxable for years. Is there something in addition to that?

Not in the US. In South Korea, new regulations are being rolled out.

Ah, okay. I do remember seeing something about regulations in Korea. Some people are also saying the drop was due to fears over China banning bitcoin mining. I'm not 100% sure if that's happened yet or not.

Realistically the market is influenced by many factors, and uncertainty with regard to China has been a constant in my opinion ... whereas BTC and many other coins were due for a correction, and the South Korea situation may have tipped things in that direction this week.