In the latest iOS 17.4 beta update, Apple made a significant move by disabling the functionality of Progressive Web Apps (PWAs) within the European Union. This decision led to widespread speculation about whether it was a temporary measure or a bug. However, Apple clarified that the removal of PWAs was deliberate and they do not plan to reinstate them.

Apple's rationale for this action revolves around the introduction of support for alternative browser engines in the EU, which presents considerable security challenges and the extensive work required for a new implementation. The company emphasized the importance of storage isolation and system prompts for accessing privacy-sensitive functions, which are integral to the privacy and security framework of native iOS apps. The absence of such measures raises the risk of malicious web apps exploiting data from other apps or unauthorized access to the user's camera, microphone, and location data.

To address these security vulnerabilities, Apple pointed out the need for a new integration architecture, a task deemed impractical in light of the demands of the Digital Markets Act (DMA) and the low usage of Home Screen web apps. Consequently, in compliance with DMA requirements, the feature was removed in the EU.

EU iPhone users can still use web apps by adding bookmarks to the Home Screen, but they will lack PWA functionalities such as offline support, notifications, and seamless integration. These apps will now open in Safari or another browser, lacking dedicated window support, long-term local storage, and notification capabilities.

Apple acknowledges that this change, driven by DMA compliance, will impact a minority of users and expresses regret over any inconvenience caused to developers and users of Home Screen web apps. This update is part of a series of adjustments Apple is making in the EU, including permitting alternative app marketplaces, payment methods, browser engines, and more, to align with new regulatory standards.