Not everyone in the world has access to the internet, and even if you do, it is very difficult to learn another language. Think about this: How much would you need to be paid to learn Mandarin? If I told you I would pay you $50k to become conversational in Mandarin, would you do it?

For a lot of people in the non-Western world, they could make more money by working more hours than they could make by dedicating a lot of time to learn English or another language.