RIM to end side-loading on PlayBook – cites piracy concerns

“Piracy is a huge problem for Android devs, and we don't want to duplicate the chaotic cesspool of Android market [Google Play store],” he said.
The other half of the equation is, developers who plan to release to App World often use side-loading to beta test their apps prior to submission. When asked about that, Saunders’ reply tweet eluded that RIM has an alternative solution in the works. While developers currently do have access to a sandbox in the BlackBerry App World, it doesn’t allow a closed beta to be conducted. Hopefully RIM will release a solution that meets in the middle by maintain control through the App World and gives developers the ability to test beta apps without making them available for general download.