But surely iCloud upload feature is on the device. And if it was only in the cloud they wouldn't need to mention iOS or iPadOS at all.
To start, once you upload something to the cloud you do - or at least are expected to - realize that it is under full control of another entity.
Because of that you might not use iCloud or you might not upload everything to iCloud.
I certainly hope you didn’t get yourself all worked up without actually understanding what you’re mad at :)