You can read about their entire stack, its not just belief, they are opening it to researchers:
https://security.apple.com/blog/private-cloud-compute/
Its extremely impressive
That's why I say: if it works in actuality the way they present it in theory, I'm fine with it.
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Even if they used half the techniques they described in this post it would already be a huge privacy improvement over the way people are using ai today.
I use my own llms on ollama.ai . 100% private and open source.