There is no issue about misleading customers here, because many apps promise features that don't work well or have other problems and the only ways for the user to figure out if an app is worth it is by (a) reading reviews and (b) trying it, and that will result in an informed decision. What's the difference between misleading users about functionality and misleading them about price? In both cases you're wasting your users' time and in both cases they'll ultimately choose not to buy.
What Apple is doing here is moving the purchase decision forward, to the point where the user knows practically nothing about the product. How can you make an informed decision if all you've seen are a couple of screenshots and some vague list of features on the App store page?