Because Africa is full of corrupt leaders, because they do not depend on themselves but on other Continents. See the giant of Africa (Nigeria) that is lacking a lot behind, see the white Africans (North Africa) not capable of latest technologies again. All Africa people know is themselves and their families (nepotism), they do not careful about others (whites and many other countries do care about others).
As you said the corruption everywhere within the African leaders and funding an unnecessary project is the reason why Africa lose it and It not that the north, west, east and south Africa are not capable of latest technology most people who are capable mostly travel abroad while those that can't afford to waste their talent. This is also what happen in the sports scheme you will players traveling abroad before they can put their talent and dream to work because every setting controlled by the African government is full of various corruption that's why some people only care about their family. Did you know that a Nigerian borne guy was among the key developer of the Lightning network?
Our leaders that were there when Colonial Masters left the countries that became independent caused what is happening.
If African wait patient before they get independent things will be better than how it is now but the government of today operate the government just like the early politicians does after the independent things will be better but most of the current leaders are greed than their destiny.
The Continent (Africa) has good agricultural products, plenty mineral resources, what left is for them to use brain to set up countries that will be standard, but they are not capable. This has just being the beggining, if care is not taken, Africa will remain like this and become even more worse.
No, they are capable. Let's say they are not capable why didn't they hire someone who's capable? They are only after every means where they can technically steal the country fund that's why African are the countries that use money buy something they have. This remind these words said by an African president.
If the African government can use this mindset and eradicate corruption Africa will have back his lost glory.