On the contrary, I have a distinct view on what bitcoin and cryptocurrencies would do for "poor " countries .I do believe that rather than bitcoin being a disadvantage to them, it would rather help them in various ways. For instance, it will help their economy if they invested and hold.
Further to this, it will help the individuals who buy into the innovation brought by blickchain and bitcoin. It will off course make them richer because of the value of exchange to their fiat which inturn, help the community and people who would need help from the local investors.
Sure, it would help them, but that is if they even have the technology to access it or if their country is really willing to embrace it and create awareness for them. It is normal that anyone who can find a way they can embrace the technology and find areas they can help themselves out will definitely end up changing their status in the long run, but we have to look at the aspect that most of these countries do not even have that infrastructure in place except few of the rich ones in government who have been ridding the normal masses anyway.