I'm trying to think of some use cases, I can really only think of two that it might be used for. Space travel and doomsday vaults.
Space travel is a no brainer and these could be used as another form of storage that contains legit everything humanity knows while having the critical stuff run on standard reliable hardware. Incredibly small and lightweight storage in comparison.
Doomsday vaults would be the same idea. Having these as another way of storing information that otherwise we would never keep due to the immense size.
6.95$ a month? Sign me up! It was going cost me more than that to do it on my own I'm pretty sure.