Bitcoin is technology-based, which means it will not run and be useful in a setting where advance technology is nil. That being said, the poorest of the poor will not be able to enjoy what we are enjoying right now in this crypto space. To send and receive Bitcoin, one needs advance technological tools such as a crypto wallet, smart phone, an internet connection, and so on. For the transaction to be processed and broadcast into the network, everything has to undergo more sophisticated mining processes that again need advance technological tools such as mining rigs, electricity, internet, among others.
If these are all non-existent in a certain area, there is no point talking about Bitcoin or blockchain or whatever. This is a new-wine-in-an-old-wineskin story.