GameCheat13 is well known in the Halo community for his efforts in leaking unannounced Halo 5 assets planned for future content ipdates. Now it seems he took things a step over the line as he was able to gaina ccess to a build of Halo Wars 2. He uploaded the entire game soundtrack on youtube and notified Microsoft about how he was able to do so. Some of his tweets have promised that if Microsoft doesn't refund his entire games library he will start selling off the Halo Wars 2 PC build to anyone who asks - this build has KEY story information on it that could ruin the story if released. Since his recent blogpost though he has since backtracked and deleted those tweets.
Reddit source.
Gamecheat13 blog update