To me money is only money whether people have faith in it. Something could be money to some but not others. The only difference between fiat money and monopoly money is the faith people have in it. If people lost their faith in fiat and stopped using it then it would become worthless. Same applies to bitcoin or anything else. If you regard it as money and people accept it as payment for something then it's money.
Wow Brad Pitt is here. Yeah true it is about how it is used daily. If it can be traded in exchange for another thing or an object then it is money. They dont use money in the past just trading through gold or silver. And up until know it can be used as a means of payment. Or you can exchange it to fiat then use it. Same goes with bitcoin.