Thank you for bringing the illicit links here to my attention, tinkertron, they've been removed.
App links are righteous when from trusted developer sites - Market, AppBrain, XDA, the developer's website and so forth.
Links to private dropboxes without attribution violate copyright infringement terms and leave our site at risk for legal repercussions.
It doesn't matter if the app is free to end-users - freedom of distribution is a different legal matter entirely. Only public-domain apps (example, permission given on the dev's website or from the AOSP) avoid this rule.
Ladies and gentlemen, this is your site, too - please keep it safe from the copyright lawyers. They are out in force and they mean business.
While it often seems that staff is being personal or over-reacting or being harsh, we're really not that way at all. We are simply on a mission to have our site protected from DCMA site shutdowns - and please believe me - that sort of thing is on the rise, it's not something we make up for fun.
We didn't invent this legal tune - but we are compelled to dance to it.
Cheers, thanks a lot.