Encrypted cloud data storage where people can store their non-sensitive files and can access or share from anywhere. Similar to Dropbox or box. Since Steem basically a big database, files can be encrypted, shredded and stored on the chain as custom_json. Users' Steem keys would put pieces back together and decrypt them.

Because transaction amounts require resource credits and RC requires Steem Power, users would need to have enough SP to use the app/service. Otherwise, they get to store their data and access it from anywhere for free.