Used this in one of my videos. Track was claimed by "INgrooves On behalf of: Broken Audio".
Obviously for the artist or the copyright holder, nothing stops them from monetizing the content in different ways or under different licenses. However, when the artist or the copyright holder entered the track on FMA, the permission extended to you for using the content according to the terms of the license, in this case CC by 4.0. You can find more info on the subject in the FAQ section on the...
Not too confident this song is in the public domain/attribution side of things based on the copyright strike I got from using it...