What are your options?
Option 1: Accept the claims
Option 2: Mute the music
If you’re worried about claims, and prefer to generate revenue, simply turn off the music in the game! Sure, it won’t be as exciting, but may save you a bit of hassle in the long run.
Option 3: Add your own music
Permission, permission, permission
This is the key to avoiding copyright issues. If you’re not 100% certain that you can upload and monetize videos for a specific game, seek permission. It may be on the developer’s website, in their FAQs, or sometimes, no where to be found. If you’re unable to find an answer, it may be best to shoot them a tweet or email, asking for an official statement – and don’t forget to ask about in-game music, as well!