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"The DMA requires that all browsers have equality, meaning that Apple can’t favor Safari and WebKit over third-party browser engines. Therefore, because it can’t offer Home Screen web apps support for third-party browsers, it also can’t offer support via Safari." — https://9to5mac.com/2024/02/15/ios-17-4-web-apps-european-union/

So they can't just release 17.4 with Safari-only PWA installs. It has to enable PWA support for 3rd-party browsers first, perhaps also new APIs like `SFSafariViewController` (webview for other native apps).