In the AppStore (iPadOS), the app is listed as 4+ and with family share. After buying the app (subscription or lifetime), you have to log in and the age rating of the app is changed to 16+. This means that the app is no longer usable for students under the age of 16 and therefore in many schools. Whether this is desired or a bug, this should be changed asap, as thousands of students and teachers work with the app here.
It is not a (big) problem if the parents of unmanaged iPads pay for the app. But it is a big problem if the app is no longer usable and students no longer have access to their digital exercise books because the age rating does not fit. Why is the app 16+?