[microtonal]

But iCloud Keychain is end-to-end encrypted using device-specific keys, so Apple cannot read items in your iCloud Keychain (modulo adding their own key as a device key, rolling out a backdoor, etc. but that applies to all proprietary software).

[blackoil]

How is the data recovered if device is lost?

[internet2000]

If you lose access to all devices in the circle of trust, the data is lost. If you're curious: https://support.apple.com/guide/security/secure-keychain-syn...

[blackoil]

That doesn't sound very promising for someone who may have only one phone from Apple or just laptop.