Terms
What you are buying, and what Mupi promises.
What you buy
A one-time purchase of the Mupi app from the App Store, at €14.99. Family Sharing applies where Apple allows it. There is no subscription and no charge per child or per camera.
Storage
Backups use your own iCloud storage, under your Apple ID and Apple's terms. Mupi does not sell storage and cannot add to your iCloud plan. If your iCloud storage is full, photos stay on the camera until there is room.
Your photos
The photographs are yours and your family's. Mupi claims no rights over them, cannot see them, and lets you export all of them at any time.
What Mupi does not promise
Mupi is a camera app, not a backup service. Keep your own copies of anything you would be upset to lose, the same as with any camera. Mupi is provided as it is, without a guarantee that it will suit a particular purpose.
Refunds
Purchases go through the App Store, so refunds are handled by Apple under their rules.