Which, due to the total secrecy of the government's process (e.g. National Security Letters), they cannot provide.
We could, of course, watch ever word we put on the cloud, including the supposed private stuff, but I'd rather not do that for a large class of things (submissions to forums like this are an obvious exception, I am after all submitting it for the whole world to see as it wishes).
The cloud can still be useful for encrypted backup, that's what I do with rsync.net to avoid loss by disaster, and it saved e.g. my email when the Joplin, Mo tornado hit 2 years ago. But put my spreadsheets on the cloud? The one tracking the blood test results of a relative's anemia (fortunately, it looks like it was a "hit and run" virus). No, I think not.