The fact that those countries supply raw materials to developed countries is necessary for the system to keep running. Because as long as those countries are exploited, developed countries can live in prosperity. Cocoa workers do not even earn as much as the price of one chocolate bar per day.
Are you saying that in a system there will always be the ones being exploited and ones exploiting them? The ones exploiting and benefiting of course wouldn’t care but those being exploited they should find a way to at least make their hardwork actually mean something and let them live with better benefits and opportunities.