This is great for personal code, but anyone who tries deploying this to a wide audience on the App Store is risking a permanent ban by Apple.
[1] https://developer.apple.com/app-store/review/guidelines/
So if I build a web app on my own dime, on my own hosting resources, signing no developer agreements with Apple whatsoever...
... there's not a remote chance that I'm subject to any of Apple's whims, and there's very little they can do about it.
Add my site to a Safari exclusions list? That will and should go down like a flaming mess.
That means you can easily be banned for abusing their wallet apis, and they'll probably also take down your other apps on that account.