alt Hacker NewsiOS allows something similar. twitter (X) will also add a logo. I believe reddit did the same but i stopped using their app a while ago.
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Chinjut • today at 2:12 AM
iOS allows something similar because this is iOS. iOS allows something exactly the same because this article is about iOS.
Reddit has a toggle in its settings to disable it. X, too, I think.
Personally, I wish iOS didn't even facilitate this.
edit: to be clear, I don't think iOS should notify the app at all. The app could register areas as "invisible to screenshots" perhaps - I'm torn on that functionality.