massive number of chinese students are spies
Jared Sperli stashed this in intel
tl;dr They are sloppy.
It's because of China's broad-brush approach to espionage that Chinese spies are typically regarded as sloppy and careless by other security agencies.
Williams said that in the spy world, three rules are followed: "Don't get caught, don't get caught, and don't get caught." Most other countries have elaborate precautions in place to ensure their agents don't get caught.
With China, the rules are different. "They just lie if they get caught," Williams said. "It's surprising how few precautions they take and how many risks they take."
He added, however, that the approach has been shockingly effective. "The Chinese are getting everything," he said.