One of the best examples you can see of developing countries using BTC to their advantage is Venezuela:

With their currency collapsing to being essentially worthless, they've needed to find other means to send (from the outside) funds to their family members still living in those difficult situations. They've been able to send funds through BTC, and consequently, the family members have been able to subsist and live using the online currency. It caught the attention of the gov't SO MUCH that they went ahead and launched a Petrodollar (SCAM) that said it would use their own oil barrels as leverage in the business.

Countries in the middle east, countries with a currency so devaluated the paper is worth more as a means to make fire than as a means of purchase, are all examples of countries that could use an un-biased, un-centralised, and un-regulated means for the transfer and safe keeping of their funds. Let the people have control over their own funds, and make small businesses that implement these so more and more people will adopt these cryptocurrencies rather than stay in the same old line of trusting FIAT.