There are two main differences. First, they take it too far. They don’t put seats in a van and call it a car, they hook up an RC controller and say it’s a toy. Second, currency and security laws are more catch-all than imports. Import laws have to be specific and deal with physical objects. “There’s a tax on candles. Is this a candle?”. Securities laws, for example, already deal in the realm of abstractions. So, a cryptocurrency isn’t as novel as people often act.