Google Drive Found Leaking Private Data
That's a very poorly worded security setting. If you're building a service where people can share something set as "Anyone with link...", you really ought to make it very clear that means it's open for anyone to download. The setting should really be named 'Remove privacy settings - allow anyone to download'. 'with link' implies some level of security that just isn't there. Even if Google proxy links within the document, there's always the possibility that someone could accidentally send a link to the file to someone, or that someone could shoulder surf it, or even guess it is if it's simple enough.