Apple's biggest disincentive to continue the practice is that they themselves end up in the monopoly crosshairs from time-to-time, and it doesn't look good in terms of the DOJ targeting them if they continue a practice that was ruled monopolistic with another company. It isn't necessarily monopolistic if they do, but it raises suspicion.

(Personally, I wish monopoly law didn't seem so much like "vibes". It's really hard to answer whether the rule is fair when the same actions have different legal consequences depending on some vaguely-defined categories like "market sector").