This is a very narrow and limited way of seeing music. Music can be created for a purpose and a setting but once it’s out there it has no boundaries beyond what you impose upon it. Somewhere Over the Rainbow was written for the Wizard of Oz but it’s not like the only way to enjoy it is in a movie theatre. Certainly, music can be more or less appropriate for certain activities and moods, listening to EDM to fall asleep might be self defeating. However, music made for games can evoke all sorts of mental states and people are free to find appropriate settings and uses outside of them to enjoy it.