I agree that it's hard to argue that people were deceived, especially considering that I've chosen not to use Dropbox from the start beacause they only used one

I agree that it's hard to argue that people were deceived, especially considering that I've chosen not to use Dropbox from the start beacause they only used one key for everyone, because employees could access my files, and so on. If I (with no degree, no formal training in information security, just my wits) knew, why didn't everyone? I'm tempted to assume "because they didn't care to read anything more than the Dropbox marketing blurbs that say 'secure'". That said, select employees having access to your files may be expected (as it's the most common practice in consumer backup and file hosting solutions), but it's not necessary. I use rsync.net for my backups because I can generate a key and use it to encrypt my data without sharing that key with anyone else. Even rsync.net's employees can't read my stuff. (Please note that this is a different type of service than Dropbox: because all my data is encrypted I can't just click to share it with others.) (I don't have any affiliation with Dropbox or rsync.net. I'm just a consumer who chose one over the other.)