More the point though, PWAs are part of the existing web ecosystem. Apple has dragged its heels bringing Safari and their Webview up to spec on anything that might damage the AppStore ecosystem for years. They've also forced browser developers to use their webview instead of the browser's engines and has kept the API broken for functionality which they support in Safari - I mean try running a webrtc application in both safari and either chrome or firefox on iOS and see the problems.
By enforcing the Webview on everyone they also ensure that all web developers need to have a mac to debug Safari specific issues that happen on a level unseen since IE7.
The EU is simply telling Apple they can't leverage this anti-competitive behaviour, just like they rightly did for Microsoft in the 90s and Apple are just trying to salt the earth in the EU. It's a joke