The point the parent is making is that Apple doesn’t have your data in the first place, therefore if things go south, or they become nefarious, you’ll have to give them your data first.
Provide a source. Apple is pretty transparent in its iCloud security overview[1] and iOS Privacy Whitepaper[2].
[1]: https://support.apple.com/en-us/HT202303
[2]: https://www.apple.com/business/site/docs/iOS_Security_Guide....
Meanwhile take a moment and review Apple's stance on privacy and security before you continue [1] [2] [3].
[1] https://www.apple.com/privacy/manage-your-privacy/
[2] https://www.apple.com/privacy/approach-to-privacy/
[3] https://www.apple.com/business/site/docs/iOS_Security_Guide....