I agree with you, except for the word 'subtly'. It's not subtle at all.
So yeah, not really that subtle, I agree.
I'm signed into reddit on the webapp, I click a link on the front page, it renders the page, then overlays a popup saying "this page is only available in the app"
and despite having the app, clicking "open in app" takes me to the apple store, so really I can only reliably use reddit if I start my reddit "session" in the app