Not necessarily. WeChat's creator, Tencent, denied storing or studying any chat histories. Like some other messaging services (such as WhatsApp), messages are supposed to remain solely on your phone or PC. Australia's military banned WeChat over security fears back in March, but that appears to have stemmed more from solidarity with US policy on Chinese companies instead of specific concerns.

We'd take the claim with a grain of salt. It's entirely possible that the watchdog was exaggerating its abilities, or misinterpreted its evidence gathering. However, the very fact that people are entertaining the idea speaks volumes about China's approach to surveillance. It hates the thought that any data might be outside its reach, and it's willing to go to great lengths to ensure it can collect that data.