Africa isn't "a large segment of the world economy",actually it's a relatively small part.I remember that the African GDP was more than 1 trillion USD,which is very little,for a continent populated with 1 billion people.
I think that Africa needs industrialisation first and then crypto adoption.Most of the african countries have 80% uneducated population of peasants,who can do only agricultural work.
This is really a parochial statement reeking of sheer ignorance. The nominal African GDP as at 2017 is standing $3.52 trillion with a growth rate of 3.7%, and 38% of the population are actually uneducated as against a demeaning 80% you cited. African are doing great exploits across the world, even in their home country. While there are farmers, who are needed by the way for food security, there are also a lot of technocrats.