I mean, assuming the whole thing wasn't made up (and I doubt it was), I think it's an instance where the news was more than just random celebrity gossip. That case touched on some important issues about domestic violence (especially against men) and freedom of speech which I think would have made it newsworthy enough on its own. From Depp's perspective at least, it was also important to have the case play out very publicly since he was trying to use it as an opportunity to clear his name.

That said, the media sure did exploit it for all it was worth. I'm still seeing articles about it and expect there will be plenty more.