> Countries like France force their colonies (former) in Africa to supply raw materials (like chocolate or vanilla) for cheap, and make billions every year by processing it and selling finished goods

Cute theory, unsupported by facts. Chocolate for instance is a simple supply chain problem: shipping cocoa to Europe is cheaper than shipping milk to Africa and then shipping chocolate back to Europe.

Where possible - nuts for example, transformation increasingly takes place locally. The bottleneck isn't some obscure international conspiracy but investor's willingness to take the country risk and establish trust relationships.