The whole notion is absurd to me. A notification is supposed to notify you that something happened. But in these cases nothing has actually happened. All these notifications are, are thinly veiled attempts to manipulate you into opening the app to then try to shove more things into you for the benefit of the company that made the app.
I'm generally very stingy with notification permissions, so on the rare occasion that one of these does slip through, it makes me furious. It feels like an insult to my dignity as a human being.