The difference between what's on the "client" vs what's on the cloud has been virtually diminished in the last few years with everything doing a cloud backup by default. Active content scanning and reporting to authorities been there for nearly a decade at least with several high profile cases every year since.
https://www.businessinsider.com/police-say-a-google-tip-abou...
https://cbs4indy.com/news/indycrime/muncie-man-arrested-on-c...
https://www.nytimes.com/2022/08/21/technology/google-surveil...