Yeah, but I didn't use it (because I think it's a scam) therefore it's not money nor currency. I can't understand these people.

I have a bank account with FIAT, and I also have BTC. I use both to pay for things. Although I mostly use FIAT, I also have a credit card that I charge with BTC to pay for things, but if I have the option I also pay with BTC directly. How is that "not a currency"? Because some people use it as a way to run scams and pay off ransomwares? Because people prefer to hold it and sell it at a higher price to get rich? Or simply because you do not understand it?