In my mind it's low of introduction of btc my self learn about it from who work with that and have income so I did too read it from net it was hard to find what does it
Some people never heard about bitcoin because of no electricity or internet connection in their places. not all people are fortunate to have gadgets to use to surf online. i guess that is one of the problem because they have no knowledge regarding bitcoin.
Lack of knowledge is the major problem for people not using bitcoin, if they have never heard about it then we cannot expect them to start using bitcoins.
The problem that people are facing is lack of knowledge about how bitcoin works. They think that it has been tied to illegal activities and I think that they are missing a wonderful opportunity in their life.