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It's pretty dangerous though. Even though crypto is mostly on the way down and out some coins will predictably lurch upward from time to time.

If you hold an asset long you have a finite potential for loss but infinite potential for gain. Short it's the other way around. Algo traders and hedgies often treat short and long positions as symmetrical as they almost are when linearized but over long periods of time and large princemovements that's wrong. It leaves you with the hedgie viewpoint that it's as bad a "risk" that the stock market goes up too much as if it goes down which is not the way most people think.

It's very risky. The price has a tendency to jump up briefly when a large short needs to cover its position.

The old adage definitely applies here: The market can remain irrational longer than you can remain solvent.