The reason why no one is complaining is that they are sensible to realize that keeping a copy of your music, pictures and documents is not an invasion of privacy. No one would go to great depths to hack and check out your pictures on iCloud. And if you feel any of your documents are highly sensitive, the simple option is not to put those on iCloud. Someone is providing you an easy way to manage your files for literally free, least you can do is appreciate it and not blame them.
Have you seen where it says you can turn this "off", or simply not upload to icloud? Not trying to antagonistic - I have a serious desire to turn the whole thing off. What troubles me already though, is that without my permission, every iDevice in my household can now see what apps I've bought and potentially downloaded on my iphone. Now, that's not a big deal in my house - I have nothing to hide, and don't have anything that my family can't share in. But that's not the point. It's the very concept that apple has turned on something that I didn't elect to turn on. And if I don't have the option to turn it off, then what else is being stored to iCloud that I didn't opt in to?
Will I have the simple option of just indicating "no apple, I want to continue living in the PC era and store things on my computer, not in your cloud"? Not asking you directly - none of us have those answers yet, but that's the question that's important to me and many others at this point.
But anyway, your post infers a simple option of not putting info in iCloud. Is this an option you read about? Would like to know.