What UX do users not yet on iOS14 experience when they scan or click an app-clip link?
Experience for non-iOS14 users
It’s just a URL. So they would get the option to view the URL in safari.
My App Clip experience urls will:
iOS 14+ Be a deep link into my app if installed or present my App Clip Card if not.
iOS 13- Be a deep link into my app if installed or will open the url in Safari if not. Then, if the user agent is iOS, my web server will redirect the user to my app in the App Store. You might want the user to see your website that includes an App Store button, but in any case the urls should “work” and not return a 404!