There was a time when the Apple app store first opened that users were not able to share apps. Then you could share apps across devices with the same owner. Then there was family sharing, however, only the base purchase is shareable. In fact there are lots of rules now. The most reckless is being able to share free apps and then having to purchase in-app separately. One very useless app from Disney cost me $26 ($13 per child). This does not sit well with me.