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Apple silently uploads your passwords and keeps them
This is a follow-up to my blog post macOS Sonoma silently enabled iCloud Keychain despite my precautions from five months ago. The TL;DR of that blog post is that when you have iCloud enabled but not iCloud Keychain, updating from Ventura to Sonoma causes iCloud Keychain to be silently enabled.
Also for development purposes, I have an iPad and a Mac mini with macOS Big Sur through Sequoia installed on separate APFS volumes. Today I was shocked to discover a bunch of my website passwords in Safari while booted into Sequoia on the Mac mini. (As I mentioned in my old blog post, Sonoma System Settings still has the bug where it hangs and crashes when you disable iCloud Keychain.
Or read this on Hacker News