In early 2018, Apple forced their users to opt-in to migrating iCloud encryption keys and data to Chinese data centers:

https://www.reuters.com/article/us-china-apple-icloud-insigh...

Chinese government nationalized the data centers six months later, gaining access to all the encryption keys and user iCloud data at rest. Apple complied:

https://mashable.com/article/china-government-apple-icloud-d...