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 still many people who don't know about Bitcoin or cryptocurrency because not all places have internet or have a data connection, such as people in tribal groups or those who live in remote provinces where it can be said that it is very difficult to earn money.
It's also often because the internet is in areas that are covered by the internet or there is a gap in it, because if there is no internet, they will not really know about Bitcoin, and the others are also not aware of social media platforms.