"When your family member accesses any of your games, they’re placed into a special demo mode. This demo mode in most cases would be the full game with a 15-45 minute timer and in some cases an hour. This allowed the person to play the game, get familiar with it then make a purchase if they wanted to. When the time limit was up they would automatically be prompted to the Marketplace so that they may order it if liked the game."
So there, you didn't lose anything, and you probably gained a ton more xbox one customers/clients..... Now more people to play with.