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. (I don't know yet whether that still occurs when updating from Sonoma to Sequoia.) What I didn't realize at the time, indeed didn't realize until now, is that iCloud Keychain already uploaded all of my...
