They were, but PUBG eventually dropped the suit. Did you read the article?
The one against Epic was dropped, but NetEase settled out of court. So it is kind of a sticky wicket when it comes to this one.
Which lawsuit does the judge take on for precedence in THIS case? Do you take "settled out of court," which means the case has merit? Or do you take the "dropped" one, meaning there wasn't enough merit THEN to pursue so why NOW?
Granted, Apple isn't 100% innocent here, as the clones are almost a literal copy/paste job, but the judge in question has two conflicting precedents from this same company to look at when hearing arguments and making the decision.