“Addressing the complex security and privacy concerns associated with web apps using alternative browser engines would require building an entirely new integration architecture that does not currently exist in iOS and was not practical to undertake given the other demands of the DMA and the very low user adoption of Home Screen web apps. And so, to comply with the DMA’s requirements, we had to remove the Home Screen web apps feature in the EU,” the website reads.
https://techcrunch.com/2024/02/15/apple-confirms-its-breaking-iphone-web-apps-in-the-eu-on-purpose