Poor countries need a very optimistic government towards new tech so that they can embrace bitcoin like tecnology and support mining bitcoin to generate free foreign currency which they can use to increase their USD holdings to become stronger economically. But most of the poor countries are poor due to corrupt political system and political unsatability and they don't have enough time to consider and learn about bitcoin.
I do believe that Bitcoin can somewhat help some poor countries but only to a certain degree because helping those countries requires allot of money.
It can definitely come with some support but Bitcoin cannot do it alone.