Earlier quoted context omitted.
> You spend the time and money developing an app, and you want your visitors to know about the app These popovers/nags/redirects are typically annoying because the apps do little to nothing to add to the content or user experience. Just because the company spent time and money developing them doesn't make them useful. Why burden users with the company's poor decision?
There is no scenario where a mobile app could be superior to the web app?
Can an app be superior because it allows other types of content that can't be done well via web technologies? Perhaps. Can an app help with content discovery? Perhaps. But when a user clicks on a link to standard text/images/video they're not looking for either of those.
If you want to advertise your app because it provides other features that a user may find valuable, that's fine. Advertise it like any other product that runs against your content. If nobody uses it there's likely a good reason. Don't force it on them.