Maybe not, but there have been cases of them removing documents from Drive because they weren't politically acceptable, like ... manifestos. You should assume

Maybe not, but there have been cases of them removing documents from Drive because they weren't politically acceptable, like ... manifestos. You should assume that anything on "someone else's computer" that you didn't encrypt is or could be read or disclosed any time, and even if you encrypt it be aware that the filename (use a GUID?) or metadata (upload date/time/location/account) can still leak information to some degree.