"Apple is intentionally leaving iCloud data insecure" ... if you'd done some research you would know that iCloud backups are not end-to-end encrypted. That means you have a choice: backup to iCloud for the convenience and give up some privacy, or turn off the iCloud backup.
It would be nice if Apple was more forthcoming with that fact but there is some onus on the customer these days to understand what's private and what is not.