It really is unbelievable how many people have had the exact same thing happen to them, and they're still uploading shit to icloud. To be honest though I bet some of them don't even realise they're uploading it somewhere.
That's the most likely explanation. Android phones will ask you to sign into your Google account, and if you use Picasa (the only default photo app on some distributions), it automatically uploads all of your photos. iOS is probably the exact same sort of thing.
How about "Don't store your nudes on a server you don't own"?