So the answer is yes.
So, by saying that, you're saying that stealing bitcoin or misleading someone into giving you bitcoin is a crime. With that opinion set in stone, that would also mean that stealing a rare virtual sword in a MMO is also a crime?
Probably Yes. If someone put an economic value in it, maybe because such sword was bought with real bucks (or even with BTC), this is a crime. I'm not sure if nobody put an economic value it this was also a crime, but maybe in some jurisdictions this is also a crime. Also if to steal such a sword you illegally access a computer/network/etc or abuse your access authorization this is another crime for which you will be held responsible.