Philanthropy is not the same as investment.

Andreesen is among those who have created markets, companies, and industries more or less out of thin air (by implementing an idea on a digital device that doesn't produce tangible physical goods like a steel factory or something) in a few years. He's giving back in a very generous way. Let's all just recognize how amazing the entire situation is, shall we?

What would he know about developing countries? There's no harm in dealing with what you're familiar with.