Why in some countries Bitcoin is banned is the accepting of Bitcoin by websites and that are illegal .
Its because some of the countries doesn't accept bitcoin yet and doesn't want to join the cyber world of bitcoin well the illegal websites are not accessible to any country because some countries are very strict when it comes to illegal website it may be a bad influence to their people that's why they will ban that website for they are not found to internet or illegal stuff in my country it doesn't matter its illegal or not but you have to do and they don't really trust the websites so far they think its a scam because they already tried it but they have been hacked a lot of bitcoin in there wallet well some, they can't really handle bitcoin because they don't understand it yet so they ban it.
