The encouranged windows 10 setting is to sync your whole profile to OneDrive.
Does this imply that apple was not checking the photos stored in their servers for CP? Then icloud must have been the best way to share it
It at least looks like apple is the last one to do this. google, flickr, facebook, twitter etc did this since forever.
Almost like Apple was the last holdout to not give up customers’ privacy, and eventually had to cave. So they came up with a sophisticated system to handle the scanning on-device, and only for data that’s already destined for their servers.