Apple periodically publishes new versions of a document called the iOS Security Guide (PDF), updated in January. For years the document contained language indicating that iCloud services were relying on remote data storage systems from Amazon Web Services, as well as Microsoft's Azure. In the latest version, the Microsoft Azure reference is gone, and in its place is Google Cloud Platform.
The latest update doesn't indicate whether Apple is using any Google cloud services other than core storage of "objects" like photos and videos.
In addition to Apple, other Google public cloud customers include Kroger, PayPal, Snap and Spotify.
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