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 the US, law enforcement is split among too many organizations to implement a Big Brother system competently. Every little police department has their own system, and private sector systems aren't integrated with government systems. Look at the mess in DC - their camera system was taken over by a botnet. Not even to use the camera data, just to mooch network resources. There's an business opportunity here. There's…
look up so-called 'fusion centers'