This may sound stupid, so I apologise in advance for my ignorance....
I watched the video and the focus of this service seems to be on storing user data in a way that can be accessed by any device. I'm an API developer, isn't this just what every mobile app that uses an API to store data does, right? I personally don't write a different backend datastore for every device type that could connect to it, nor do I 'permanently' store data on the device! user data is always synced 'for me' over an API. I don't get this, can someone explain why we need this service? Do people develop apps different from me? I'm not being sarcastic, I'm genuinely interested.