Fair enough on DCAU Harley, I was more just trying to point that Injustice didn’t originate this idea of Harley getting villain cred by being the Joker’s sidekick but not getting the same treatment as Joker does. It’s present there in even her first incarnation.
But yes aside from RotJ, broadcast standards meant she and Joker were more reigned in than they are in comics or video games. So there was only so much they could get away with.