Who would've thought? This isn’t going to fly with the EU.
Article 5.3 of the Digital Markets Act (DMA): "The gatekeeper shall not prevent business users from offering the same products or services to end users through third-party online intermediation services or through their own direct online sales channel at prices or conditions that are different from those offered through the online intermediation services of the gatekeeper."
Friendly reminder that you can sideload apps without jailbreaking or paying for a dev account using TrollStore, which utilises core trust bugs to bypass/spoof some app validation keys, on a iPhone XR or newer on iOS 14.0 up to 16.6.1. (ANY version for iPhone X and older)
Install guide: Trollstore
I could be wrong on this, and don’t know all the details in the case, but EU-law is often interpreted teleologically, meaning in a way that is the most in accordance with the objectives and goals of the legislation. So in this case, if Apple is in violation of the spirit of the law, the EU Courts would likely rule against Apple. (source: 1st year law student)