You are absolutely right mate, blockchain technology and the adoption of cryptocurrencies should be tried and tested by the developed world before it goes massively to developing and under developed countries. Most of them are likely to abuse the system, get scammed numerous times and later scream on top of their lungs about the failing of this technology when they are definitely the root cause.
Let's not forget this saying, Lack of knowledge my people perish. With illiteracy rate hovering over 60% how sure are we that some of these folks are going to comprehend all the intricacies of cryptocurrencies.