I think poor countries can help by bitcoin if the people in poor country have pc or gadget and internet connection, if the people in that poor country can not afford that i think bitcoin can not help them.
That is an obvious thing because bitcoin is still digital and it cannot be used without internet and devices like mobiles or computers, so if a country is as poor that the people of that country does not even have these things then it wont be able to help them at all.