Reading this thread somehow pissed me off.
The concerns of this guy are legitimate, I think that some Delphic employee should be there to answer such enquiries even with a simple kindly excuse. Letting your users respond help but I feel like this guy will simply cancel his account and advice all his friends to not use it.
I wonder if running dropbox as a user with read access but no write permissions would solve this guy's problem. I also wonder whether it would work at all. :-)