Hang on , music in gameplay is different though. If I were part of an MCN I'd be asking to see in writing that they have a binding contract which would exempt them from any copyright responsibilities. Which I highly doubt they do, that goes back to the old myths that MCNs protected you from copyright strikes on games. I know MCNs have their own libraries of music to use in videos, but using it from a game that has 3rd party music is different, 3rd party music requires royalties to be paid by the developers/publishers. It's why Rockstar had issues with San Andreas in the past, music literally had to be patched out of the game cause their license ran out, eventually it was fixed. From what I'm aware of, a developer/publisher can't legally pass this license onto an MCN nor a content creator.