In fact, I am very sad with their defects, about the types of congenital diseases involved.  They may not see, or the possibility of, using bitcoin but they can hear about it.  For blockchain technology from bitcoin, there is still a percentage of people who cannot feel, cannot discover by themselves because the intellectual problem related to the proportion of educated people in difficult and underdeveloped countries is still unknown to bitcoin.  These are also quite unfortunate downsides to bitcoin's popularity but it's not much