Supermarket loyalty card schemes give away medical insights into people & households, that they perhaps wouldnt want as public knowledge.
Search engines get given all sorts of data by people who give away medical data, financial data, crimes, both as victim and as perpetrator, past and present.
Social media interests give away data about people as well.
The internet is one giant intelligence tool and your every move, your every click gives away stuff.
In the 90's I had a Visual Basic addon AI which could work out who was typing at the keyboard. There was no need to have login screens and passwords, your typing pattern identified you.
Today smart phone's can tell if its you from the pressure of your finger, the surface area and shapes made by your finger as it moves around the screen. Again no need for login screens, but some people do know just how often women go through their partners smart phones! I'm surprised more women dont play poker!
This information wont be made known for a very long time if at all because not everyone on the planet is using the tech. If the true scale of surveillance was known, it would have to be broken to them gently as it could cause civil unrest.
Carte blanche access to peoples computers has been going on since the internet appeared.