From my understanding, that is how Apple encrypts on device. They don't use this with iCloud data at rest and instead maintain encryption keys themselves [1] so

From my understanding, that is how Apple encrypts on device. They don't use this with iCloud data at rest and instead maintain encryption keys themselves [1] so in the event of, for example, a user losing their credentials, they would still be able to assist. [1]: https://support.apple.com/en-us/HT202303 https://support.apple.com/en-us/HT202303