GR00T: Dropbox? Or are they included in the first group as well?
The biggest issue is "legalese". All cloud services are going to have to write terms which allow them to move your data between servers or along their networks. If its a spreadsheet or document, they may need to translate that document to a format compatible with any updates, In explaining that process, some people may find the "legalese" explanations too vague for their liking. Google Drive and Dropbox both had terms that some people read as objectionable. But if you read the terms together, they were trying to give themselves the rights to apply language translation services and the like to the data as well as the right to display your data to a group you've allowed. So if you upload a spreadsheet, Google can translate the tabs and such into German for a German user; if Google Sheets gets an update, they can translate the data to the new format.
I've seen some the the articles complaining about terms and conditions, but they seem to be cherry-picking the terms quite a bit. I don't find those terms unnecessarily broad. It reads to me, they are making a big deal about nothing. Both Google Drive and Dropbox were called out, but if you really read what they are saying (in context with the other clauses), they aren't saying anything nefarious.
Let's take Google Sheets...
You have a spreadsheet. If I want to share it, Google needs to have the right to display it. Maybe Google outsources their help services, they need to be able to share the document you are having problems with to their contractor partners. If Google Sheets gets an update which adds new features, google may need to modify the file format to store information about these new features. To make it more useful, they want the right to overlay Goggle translation services so users speaking a different language can still use it.
It comes down to the nature of cloud services. The only "service" with no T&Cs is going to be your own hard drive or CD-ROM. Any cloud services are going to demand some right to transmit, modify, send access to your data to their partners etc if necessary. If you find that objectionable, then maybe you shouldn't share it across the internet.