Removing games from player inventory is very rare; I've only seen it happen when malware is uploaded to Steam as a game.
I have a few games that can't be played anymore, like Super Bomberman R Online and The Crew. I still can download their files from Steam; but I can't play them.
But now I'm curious too, what could've happened that got that game removed from the people who bought the game
Does your dad want to go out of this clean, or does he still lean towards crime?