If apple is countersuing for lost revenue due to fortnites in app payment system, does this mean apple will need justify the value of their 30% cut, and in turn potentially have a judge declare its too much?
I mean, Epic will be able to argue that it was illegal, they were able to argue that anyways. The exact value for the cut isn't really a legal issue though, if the cut is legal in the first place then the existing contract will almost certainly hold and it will be 30%.
Why would they need to justify it? It does not really seem to be in dispute that the contract both parties entered into specified a 30% cut, and courts are generally not in the business of revising mutually agreed upon terms of a contract.