This is the secondmost result that comes up when searching "Battlefield" on YouTube.Yes, in the description, they indeed are
selling their "remix" on Amazon, iTunes, and playing it on Spotify. You better damn well believe they're breaking multiple copyright laws.

You know they're pro when their "remixing" software is Audacity.
Also, just realized, the description also shows it on Content ID. That means, YouTube will flag and put ads on your video if you use the SPECIFICALLY NIGHTCORE'd version of this song. Who gets the money? This weeb.