Chromeo on 13 August 2014
As has been said, it's frowned upon for various reasons. It is simply paying a company to not allow that game on competing platforms.
Usually it's just an annoyance for the people that can't play the game on the rival console, which is usually the case with new IP's or reboots of a franchise.
In the case of Rise of the Tomb Raider, this is a game that is a direct sequel (prequel) to a version that was completely multiplatform. In fact, they JUST came out with a version of said game months ago. It would be like the next Assassin's Creed game being announced as fully exclusive to PlayStation platforms or the like.
