My game ban is from using an fov changer in CoD Ghosts. ♥♥♥♥ Infinity Ward, their lying and aweful PC ports development.
My ban: http://i.imgur.com/bTC8zT3.png
Official statement that they wouldn't ban fov changers: https://web.archive.org/web/20150425224857/http://community.callofduty.com/thread/200397140#205674719
Policy change 3 months later: https://i.imgur.com/vyyyPjM.png
Keep in mind, when they enacted this change, the only people that were alerted about it were people that opened up the game *at the time*. Anyone who did so later (i.e., me) had no way of knowing the change happened. After banning FOV changers, they introduced an in-game FOV slider which only went up to 80. Not even up to the standard 90 that most PC FPSs can do, if not more. BO1-4 allow FOV changers to this day, it's specifically an Infinity Ward problem.