The 50% longer answer is 'yes':

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).