You're misunderstanding - it was that she hadn't been clear upfront that it was a taster with the full game behind a paywall, and went in expecting something more like the ad-supported free autorunners her son has played before. I knew about the game from announcement (or from the first hints of it from people like Serkan Toto) and knew what to expect in terms of pricing and content etc., but she stumbled over it in the app store and downloaded it not realising what the payment structure was like.
Not everyone will do even cursory research before downloading - let alone what we might do in terms of finding out about a game and keeping up with news - so I think absolute clarity is best for this kind of payment structure, and my impression is that there has been at least a little bit of confusion over it here.
It doesbt need extensive research. Had she ever download any game from apple store at all? Cause i remember majority of have have some kind of in app purchase.