[MBCook]

Apple has rules against circumventing their billing system. Netflix gets to do it because the service works if you don’t have any iOS devices.

I’m not sure someone like Fortnight could get away with bypassing it. If they did it would only be due to being a special case due to pull. No normal app could get away with it, you’d get pulled fast.

[ihuman]

IIRC you're just not allowed to programmatically open a web browser; you have to tell the user to do it themselves.