I have no source, but I remember seeing a graph of where iPhones sell and places like China/India were 80% android phones (mostly Samsung I think).

I don’t think the asian marketplace puts Apple products in such high regard as the US.

Samsung phones are still premium, I think they appeal more in other countries.

I see what you mean though with 20% of just China being almost the US population, but they are still losing 300m customers.