All that security, and then by default Apple literally just sends themselves a copy of your encryption keys to store in iCloud backup, the only cloud backup solution Apple allows you to use. "to help you recover your data" [1] (oh and also to send law enforcement your message history in plaintext on request, but we don't talk about that).
[1] https://support.apple.com/en-us/102651#:~:text=in%20iCloud%2...