No expert but in general, surly shorting is as dangerous as going long. If you using margin while shorting and price goes up you screwed. If you using margin while going long and price goes down you are screwed.
Yes, spread-betting seems little better than a casino, with a high risk of being "margined-out" by moderately small movements, or unethical behaviour of these betting companies. It is a real pity that there is not a less risky method of shorting cryptocurrencies right now ... could be very lucrative.
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