Backing Up Discontinued Apps
Electronic Arts (via John Gordon):
EA is removing several of its older titles from the App Store, but if you already own these games, you will still be able to play them without interruption.
As always, we encourage our players to back up their app purchases in iCloud. If you uninstall the app without backing it up on iCloud or iTunes, you may not be able to redownload your game.
My understanding is that iCloud only backs up App Data. So if you want to restore an app that has been removed from the store you would need to have a backup in iTunes. And that app will probably never work with Family Sharing.
