Bitcoin is a currency, yes, but it just started to be popular in 2017. It all just started, we need to wait for Bitcoin to become real currency in real world. It will happen when common people start perceive Bitcoin just like a dollar or euro, but better, stronger.
I agree.Bitcoin is really gaining its popularity as more years passed by.It is considered an online currency because it is just being used as a payment system in some online transactions but not totally used in the real world since it is not yet adopted unlike fiat currency that is already being used by all people in different countries.