More correct headline should be "China using big data to detain people who did not commit any crime". At that point you're realizing this has already routinely

More correct headline should be "China using big data to detain people who did not commit any crime". At that point you're realizing this has already routinely been done by many countries, including China, without using any big data at all. In fact, detaining people who didn't commit any crime has been done before people knew what "data" is.