I would guess this has been discussed before but I haven't seen it discussed by the current VGChartz users.
Several of us thoroughly derailed someone else's thread earlier debating what exclusive means when it comes to video games. Personally I feel like a game is only exclusive if there is only one LEGAL system to play it on. By legal system I'm excluding emulation. That means you can't say Breath of the Wild isn't exclusive even to Nintendo because I play it on my PC. Sure you can do that but it isn't legal to the best of my knowledge.
If we wanted to exclude PC I would then use the term Console Exclusive.
If a game was cross gen (like BOTW) or cross buy then I would say it's a Nintendo Exclusive.
Just because a system is excluded (i.e no version of the game exists for that system) I would not say that the platforms that have it are exclusive. This was the root of the argument for the person i was debating with earlier.
Some people call an X-box game exclusive if it isn't on any other consoles but it is on PC.
What do you think? How do you define EXCLUSIVE? Are there exeptions to your rules?