Well, I think it's not just simply "protectionism", but because the Chinese government really want to enforce censorship on all digital products used by people

Well, I think it's not just simply "protectionism", but because the Chinese government really want to enforce censorship on all digital products used by people living in China. When Google refuse to follow that, they are just simply not allowed. I have seen foreign companies built products in China but they all have to agree to these censorship laws. Disclaimer: Chinese too. :-)