It is impossible to educate everyone about the risks of the cloud. Even if it goes mainstream :( I tried with my family many times, but they never fully understand it.
I remember using sites like http://ftpsearch.ntnu.no probably 15 years ago to find very interesting files on public FTP servers (but I don't think that this one exists anymore)
(I don't know whether it's coincidence that they're both of Russian origin.)