Why doesn’t Air View work in certain parts of the world, such as China and parts of India?

Why doesn’t it work in certain parts of the world, such as China and parts of India?

The service is relying on Google Street View, which is not available everywhere in the world. China is one example of a country that doesn’t have Google Street View, and in India only some parts are accessible. But many of the world’s biggest cities and places of common interest are included in Air View.