[NamTaf]

Some apps detect if you have a 2FA auth code copied and auto-pastes it. I think Discord might be one? I can't remember which, but I've seen it on at least one app.

I can totally expect others to detect copied URLs that may belong to the app's domain and then offer to direct you to that particular URL (for example, I think the SomethingAwful app on iOS does that - if it detects a forums.somethingawful address it'll offer to load that particular thread for you).

That said, I definitely want to see more visibility about when and why this is done. Apple are absolutely in the right to show me a popup whenever it happens, so apps are forced to be clear and transparent about it.