[LukaAl]

Not sure about that. You assume everybody will be happy to work in GoogleDocs to write their assignment. But that's not true. If you are a commuting student you probably want to write it in an offline tool (even the notepad is fine). Also, sometimes, especially if you need to be creative, to plain old paper are a much better tool to write the first draft. Finally, I like to use a spellchecker a little bit better than the one provided by Google Docs, so I will probably run the text in it and then copy back to Google Docs. Never in my flow I cheated (unless using a spellchecker is cheating that could be true for an English class). But it will be very difficult for me to prove it because you assume cheating is using a different tool from the one you try to force me. That's not fair!