

Basically the kind of manpower-heavy surveillance like the Stasi did has been done for a long time, but the full automation of it as done in countries like the US and UK has only been possible for about 4 decades for text (and for just keeping track of who people made voice calls to, but noy the contents of them) and maybe 2 decades for voice contents.
You need digitalization so that all communications are digital and computers to properly automate the tracking of people’s communications and voice-to-text software to convert voice information into text so that the automation also works on the contents of voice comms.
Mind you, what’s being done in the US and UK (and Russia, and China - it’s just that the US and UK were supposed to be Democracies) is the same as the Stasi did in East Germany, just automated and with no need to place eavesdropping devices to eavesdrop on conversations not over communications devices, as people nowadays carry their own personal eavesdropping device with a microphone, camera, full networking and fully controlled American software in it - the smarthphone - so it can just be remotelly ordered to record and conversations and images in its range.




People (I suspect most if not all Americans) are unironically cheering for an automated version of what the Stasi did.