Just about as sensible...
... as uploading all of your private data to Google Drive so that they can sell it on to whoever they like:
http://www.google.co.uk/intl/en/policies/terms/regional.html
"When you upload or otherwise submit content to our Services, you give Google (and those we work with) a worldwide license to use, host, store, reproduce, modify, create derivative works (such as those resulting from translations, adaptations or other changes we make so that your content works better with our Services), communicate, publish, publicly perform, publicly display and distribute such content."