Is Google Drive worse for privacy than iCloud, Skydrive, and Dropbox?
theverge.com
theverge.com
"Google is giving itself all the permissions it could possibly need"
Then
"We will ask for your consent before using information for a purpose other than those that are set out in this Privacy Policy."
Doesn't mean much, irrespective of the policies of any other business.
Google - "giving itself all permissions it could possibly need" including creating derivative works of any kind.
Dropbox - "solely to provide the Services"
Skydrive - "solely to the extent necessary to provide the service"
iCloud - "solely for the purpose for which such Content was submitted"
Basically Google can do anything they want with your data, but the others can only use the data for what you would expect (storing/syncing your data).
Seems reasonable enough to me. Seems like you're taking the wording to the logical extreme and rolling with it.