No matter how you think about LLMs and their uses, the way Apple seems to be working on how to use them in a privacy-preserving way when needed in their datacenters is honestly bonkers. I wouldn't be surprised if that system gets used for other non-LLM-based cloud features/services in the future.
I highly recommend reading the whole article, I won't pretend to be able to make a good summary but there's genuinely interesting stuff.
Given Apple's track record on user safety with their OS/hardware, I'm 100% inclined to believe their system works and they plan to release the firmware of the OS/bootloader they run on their "private cloud compute" nodes publicly, which is wild to see from Apple of all companies.
You can tell that they're really treating user data as a liability which is a good way to think about that stuff IMO.