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Sounds like what could be a useful built-in OS feature. Along the lines of:

"Aim camera at QR code to put "open-link" icon on your home screen"

Does something like that not exist?

Devs can pretty easily implement this on their site using the BeforeInstallPromptEvent.prompt method.

Though of course...

> This is not supported on iOS.

It could, right? But let me tell you a secret: Apple doesn't want PWAs/web apps and actively limits Safari to force developers to build apps.