I explain it in some detail here https://www.youtube.com/watch?v=G4EKbgShyLw https://www.youtube.com/watch?v=G4EKbgShyLw Essentially we use Eth because we don'

I explain it in some detail here https://www.youtube.com/watch?v=G4EKbgShyLw https://www.youtube.com/watch?v=G4EKbgShyLw Essentially we use Eth because we don't really need a 'cryptocurrency' as much as we need an api for cash where very small payments (10c) are practical. For reasons that I explain in the presentation the key simplifying assumption of low fee transactions makes a simple billing scheme (pay per forward) work.