If you read th e UA you wil find some words that say the game is not yours only lent to you to play. You never owned it never.
Here's the one from Black Ops was the closest to me
LIMITED USE LICENSE. Subject to the conditions described below, Activision grants you the non-exclusive, non-transferable, limited right and license to install and use one copy of this Program solely and exclusively for your personal use. All rights not specifically granted under this Agreement are reserved by Activision and, as applicable, Activision’s licensors. This Program is licensed, not sold, for your use. Your license confers no title or ownership in this Program and should not be construed as a sale of any rights in this Program. This Software License Agreement shall also apply to any patches or updates you may obtain for the Program.
So remember this everytime you drop 70 bucks on a game. It is wrong period and shame on them.