I don't want to be arrested by the FBI and my life ruined because my daughter, who is 6 and doesn't know any better, takes a selfie with my phone while she happens to be undressed/changing clothes and the photo automatically syncs to the cloud.
By that logic, how do you know it hasn’t already gone there, years ago?
And this scan is currently happening on the server. They’re just making it so that the scan will now happen at the time of upload as opposed to N seconds later.