But this is not about removing the ability to read screen content. It's about removing the ability to read screen content without telling the user.

That's why I think questions about frequency and "most users" (nebulous term, I admit) come into play: yes/no permission dialogs aren't the best and many users do just click through them without thinking, but there's a world of difference between asking several times a day and asking a couple of times a month.

If my usage is far below average, then I agree that it's probably better not try to restrict it. If, as I would guess, I use it more than most, then it feels exceptional enough that letting the user know when it's happening would be fine.

If you could give a permanent permission to a given app, I'd imagine even the daily streamers wouldn't be too badly inconvenienced.