For example I am trying to put a game on my child's iPad. The game is free but you only got one level open. If you want to play the other levels you got to pay. But it won't simply unlock the game, no, only a small part. If you want more, pay more, there is no end to the "buying" phase. This is a no-go situation with children. They can be tricked into clicking these in-app sales and getting stuck there. And that's what the developers want.
I want once I pay for a game, to know that 1. it will never advertise upsells or anything else 2. it will never block access for any feature 3. there are no trick links, buttons or UI flows to get children into the buying side of the app. On AppStore I can only find the Apple Arcade games to be clean, and those are subscription based.
The moral - I want to buy and have no choice of decent apps. How did we get into this mess after 15 years of App store evolution?