I'm hoping you've simply not really thought this through. We can't demand that parents be held accountable for what their children do while also forbidding parents from knowing what their children are reading, watching, writing, hearing, or saying.
There's no reason that knowledge has to be garnered surreptitiously. (If your answer is "if it's not surreptitious, then kids will try to bypass it" … well, they will anyway.)
The comment (https://news.ycombinator.com/item?id=29571643) to which you were responding (https://news.ycombinator.com/item?id=29571750) says:
> You're asking me? Ok: it should not be possible for you to install surreptitious screen recording software on an iPhone.
I agree with this 100%. It should not be possible on any platform. Key word there being surreptitious.
To clarify, your comments are about iOS apps. Look at their MacOS apps, and it's a different story. The capture the entire devices screen, not just the web browser. And several competitors do it.
So are you still sure I should never be allowed to run this code on my phone?
But this is totally besides the point. We're not discussing what Apple's rules ought to be. We're trying to help figure out what they are. That's what the author of this app asked us to do.