Sorry. I clicked on "Read for Free" when I should have clicked on "Buy now with 1-Click". That's how I was sucked into the join-our-club crap. My Amazon-UI-mind-reading powers are weak.
Frankly, this is better than what is normally submitted to HN for things like this. Usually it's a web page about someone talking about how deep links in apps mean better engagement, offer up a blog post of the top 10 reasons... on the company blog for a company that tries to sell this very service.