[kazoomonger]

> it’s attaching a cryptographic voucher to every photo uploaded to iCloud that, if some number of photos represent hash matches

OK, but what if Apple silently pushes out an update (or has existing code that gets activated) that "accidentally" sets that number to zero? Or otherwise targets a cryptographic weakness that they know about because they engineered it? That wouldn't require "significant modification".

Funamentally, it's closed software and hardware. You can't and shouldn't trust it. Even if they did do some "significant modification" how are you going to notice/prove it?