You are right that the money will go out of the local economy, but this is not excuse for making better tools and technology.

For example I live in Europe, and when I get an iPhone... the money goes to the US, but this is not a problem as its technology and its an extra in my life.

But see when you have to buy basic things for living, like food, fuel etc... from non local companies its a problem.

Especially the poorness of Africa is deeper subject and i don't think that tools like that are the cause of it.

This thing can be applied my many more places that lacks electricity and its rather good than bad to have it.