Laws around cryptocurrencies vary widely between countries. In a good chunk of them, while not considered to be "money", bitcoins are viewed as "digital assets"

Laws around cryptocurrencies vary widely between countries. In a good chunk of them, while not considered to be "money", bitcoins are viewed as "digital assets" (that you maybe have to report for taxes) and as such theft laws fully apply (but of course the thief still has to be found and not be on the other side of the world...)