The BSU is a unit (megabyte) in the inery, so the fees are paid in this unit. Inery is not a Google Drive or Dropbox solution. The basis is currently there to set up a database solution. Specifically, Inery is a decentralized virtual database solution on a blockchain. The future of Inery is based on IneryDB, which can be compared with central databases such as mongoDB etc.
Inery use the decentralize technology which is developing very quickly. I think that it is impossible to compare Inery with centralize storage.
Now decentralize technology can be used in different spheres. It is cheap and secure. That is why decentralize projects are so popular now and they have a lot advantages.