Earlier this month, China shut down iTunes Movies and iBooks just six months after Apple introduced the services there. Billionaire investor Carl Icahn told CNBC on Thursday that he sold his Apple shares because "you worry a little bit — and maybe more than a little — about China's attitude."
Analysts from UBS and Goldman Sachs have published recent reports discussing China's potential power to thwart Apple's growth, and Eurasia Group founder Ian Bremmer said earlier this week that China is very likely to limit Apple's access to the country's consumer base.
Looking at the competition, it's clear that history doesn't favor Apple.
Google, Facebook and Twitter are shut out of China, while enterprise vendors IBM, Cisco and Hewlett-Packard have struggled in the world's second-biggest economy because of government-favored domestic rivals.
For Apple, it's a massive overhang. Greater China (including Hong Kong and Taiwan) accounts for 25 percent of revenue and has supplied the majority of its growth, thanks to the rapid expansion of the Chinese middle class.