To me i think there are some part of the world that still don't know anything about Bitcoin, because there are people in USA, UK, Australia, Canada, China,etc. even in Nigeria there are people that don't know anything about Bitcoin, they always think that Bitcoin is a scam, but people that know about it are making thousand of Dollars,($) I think they don't know that we are in a digital world now.
That's basically how the whole system is designed, you don't expect everyone in the whole to know about Bitcoin, I mean not everyone is open minded or even literate enough to understand that there is actually something called Bitcoin and people use it to transact and also as investment that could possibly earn them tangible returns in the future. Okay I could go religious and even state a claim about the christian faith that is actually being preached and spread to every corner of earth but yet some places still don't know about JESUS and even Christianity as a whole.