The same thing is happening in the US. The difference is that the authorities here use much more subtle methods so it doesn’t appear pervasive. It is known that use and abuse of stingrays is rife in our cities and gag orders allow even wider silent collection of data we give up willingly to tech companies because we can’t see what’s done with it.
In China, collecting your bio data is more like a procedure than a choose.
For example, I renewed my citizen ID card few weeks ago, and got my facial and fingerprint collected.
Also, some companies like Alibaba are helping the data collection: https://www.engadget.com/2017/09/03/alipay-facial-recognitio... and http://www.solidot.org/story?sid=47235 (In Chinese)
I believe all those data will be used to help tracking people.