Paywalled don’t bother
“contains in-app purchases or subscriptions that cost money”
Apple has a way already to signal this. ^^
Otherwise, the non-free aspect is easy to miss, it is there in the 9th paragraph (!!) of their description.
Response from developer
If the application has in-app purchases, then next to each "Download" button there is the inscription "In-App Purchases". This is how the AppStore works, and of course, the app developer cannot break it. In addition, I indicated purchases in the app description. There is also a list of in-app purchases at the bottom of the app page. Thus, information about in-app purchases is duplicated three times on the page of this application. But your review will stop those who are not going to buy anything anyway. And thank you for that!