Comment by SubmindAlpha66

Nah, Apple doesn't do this.

If the user's MacOS FileVault disk encryption key is "stored in iCloud" it resides in the users iCloud Keychain which is end-to-end encrypted. This creates a situation similar to the iPhone, where Apple does not have the ability to access the user's data and therefore cannot comply with a warrant for access (which really annoys organizations like the FBI and Interpol)