So far only in beta iOS 17.4
Apple, as you know, under pressure from a new EU law, will allow iPhone users in the EU to install applications from third-party sources. It turned out, in «revenge» for this, Apple began to disable support for web applications (Progressive Web Apps; PWA) for EU residents.
Apps no longer work in the iOS 17.4 beta, and Apple has confirmed that this is a deliberate decision. The reason for this decision lies precisely in the new legislation of the European Union. Bringing PWA apps into compliance with the Digital Markets Act (DMA) will require an entirely new integration architecture that is impractical to implement, the company says. One of these changes in particular requires Apple to allow third-party browsers to use their own engines in iOS, which is a problem because web apps are built directly on the Webkit engine that Safari is based on.
As a result, now in iOS 17.4, sites added to the home screen do not act as PWAs, but only as bookmarks that open a new tab in the browser.