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.
There are many reasons why most people in various countries don't know anything about Bitcoin, their limited knowledge of technology is the most influential reason for them. There are also those who have wrong assumptions about Bitcoin which makes them ignore the entire potential that exists in Bitcoin.
When you find someone who considers Bitcoin to be a fraud, easy to hack and Bitcoin as a place for money laundering, then you have to give them a positive opinion about all the advantages of Bitcoin. Bitcoin is a very young technology, it still needs time to develop. I firmly believe that Bitcoin adoption will become more widespread and will happen when more people are able to give a positive view to the advantages that are hidden behind Bitcoin.