At least on KDE media focus is first come first serve. The first media player to start playing gets the media keys until it stops and then whatever else is play

At least on KDE media focus is first come first serve. The first media player to start playing gets the media keys until it stops and then whatever else is playing or plays next gets them. The only unintuitive part is that maybe it should first try to play / pause the active window before delegating to that priority.