I’ve spent the past week trialling the available piano apps for beginners and this one seems to be the best of the bunch.
I’ve been running a similar thing for Netflix for the past few years.
A family account can be shared with 5 people. £105 a year. So however many people interested divided into that amount.
Forgot to add - like Netflix, the app has 5 profiles so your progress is saved within that profile.
Let me know if any questions