angola's minimum wage $60 a month (/4/40=$0.375 an hour)
kenya minimum wage $130 a month (/4/40=$0.81 an hour)
nigeria  minimum wage $80 a month (/4/40=$0.50 an hour)
mozambique  minimum wage $50 a month (/4/40=$0.31 an hour)

bitcoins tx fee just to move funds costs ~20minutes to 1 hours minimum wage.
many africans learn about bitcoin. find out it isnt suitable and just use it as a gateway into altcoins which are cheaper and more suitable to transact with.