If you feed it the library to recreate then this seems like it would necessarily be a derivative work and thus copyright infringement. Proving that they did it may be a challenge...
I work on PWABuilder, Microsoft's open source dev tool that packages PWAs for app stores.
I can say with certainty Apple has been hostile to PWAs.
Unlike Google Play and Microsoft Store, iOS App Store doesn't allow publishing PWAs. (You instead have to build a native web view app to load your PWA.) And many of the PWA features just don't work on mobile Safari.
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