Background App Refresh was added in iOS 7 which launched 8 years ago.
I guess I could have said almost a decade ago.
So, again, Apple only discussed scanning the iCloud Photos portion of their cloud service some time in the future, but NOTHING is being scanned now.
Google, on the other hand, has been scanning everything in your account for the past decade.
Also, documents from the discovery phase of Google's various antitrust trials show that Google has literally pressured device makers to hide the privacy settings from users.
Google also buys a copy of everybody's credit/debit card transaction data so they can spy on your real world purchases as much as they spy on your online life.
A company with surveillance capitalism as it's business model, like Google, will always be motivated to violate user privacy as much as possible.
I don't know why you're still trying to pretend that Google's cloud service is separate from Android while Apple's cloud service is not separate from iOS?