Also this doesn't imply that user privacy is less secure, since they probably still encrypt user data before it goes to Google's servers.
>But in the latest version, the Microsoft Azure reference is gone, and in its place is Google Cloud Platform.
To me, this seems to imply that they still use Amazon.
> The encrypted chunks of the file are stored, without any user-identifying information, using third-party storage services, such as S3 and Google Cloud Platform.
5 years ago, selling SaaS hosted on AWS to retailers was an instant no-go "we're not funding our competitor" was told to many of my competitors
Nowadays, they've come to the realization that by refusing to do business with companies relying on AWS they were in effect loosing more money.
(I am specifically referring to retailers in orders of magnitude of WalMart. mom & pop shops never cared or asked questions)
> The encrypted chunks of the file are stored, without any user-identifying information, using third-party storage services, such as S3 and Google Cloud Platform.
https://images.apple.com/business/docs/iOS_Security_Guide.pd...
Page 53.
It still looks pretty bad for them.
They take security for these things seriously. You can store data safely even in adversarial clouds.