"Apple", and "standing on principle", wow what an oxymoron.
The issue, I feel, is that there is a fundamental disconnect between the legislation being passed, and what the government is actually trying to achieve. Apple is no fool. They know very well that developers want to be able to use third party payment options precisely to avoid paying their revenue cut (it was never about freedom of choice), but because the legislation doesn’t expressly state this, it gives Apple to leeway to implement the ruling in manner which results in the least impact for them.
Until the government steps in personally and tells Apple straight in the face that they are not allowed to charge them a single cent, I don’t think anything is going to change.
And the government will never do such a thing, because then they will have to do the same for other app stores like google and maybe even Sony or Nintendo.
And for what it’s worth, I do believe that Apple does genuinely believe, with every ounce of their corporate fiber, that they are entitled to this 15/30% cut for the value the App Store provides for the developer.