Also, iCloud backup and several other dangerous "features" like iMessage are enabled by default whenever you sign in to iCloud so there's a few backdoors already standard to anyone who uses iCloud. If you sign in in settings, it automatically signs/opts you into iCloud, even if you don't want it.
cloud backups are also very problematic because they contain a lot of sensitive information and are not safely encrypted.
> If you choose to enable Advanced Data Protection, the majority of your iCloud data — including iCloud Backup, Photos, Notes, and more — is protected using end-to-end encryption. No one else can access your end-to-end encrypted data, not even Apple, and this data remains secure even in the case of a data breach in the cloud.
Which requires you first setup 2fa, which itself requires 2 keys.
https://support.apple.com/en-us/HT212520
I’d be more worried about these ota security patches they can send out whenever and how easily it is to MITM that process and send down exploited security patches. I’m sure it’s already happening in the wild
Metadata means nothing.