Carl Icahn just broke up with Apple.

The billionaire, once one of the company’s biggest stakeholders, said he sold his shares because he was worried about Apple’s relationship with China’s government.

The company’s second-largest market is facing a potential crackdown by the Chinese government.

Apple sales in Asia have dropped by almost a fifth, which accounts for 40% of the company’s worldwide sales.

Meanwhile Apple users in China can no longer download books and movies from the company’s massive online collection, after Beijing’s top media regulator reportedly called for iBooks and iTunes movie store to be shuttered.

The bigger question is whether Apple will ever have another product as successful as the iPhone, the most lucrative in the technology business to date. Enthusiasm has waned for some of its other older products, such as iPads, and its newer ones remain niche offerings.

As The Economist acknowledges, there are lingering doubts about whether CEO Tim Cook can produce the sort of smash for which his predecessor Steve Jobs was so feted.

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