Here is what I’ve found out about the inital use case of Cardano will be, and it is addressed in one of the IOHK videos, which talking about how Cardano and be a platform for devleoping a fair gaming and gambling experience as well as how that would benifit the future of Cardano moving forward.
Here is the link to the video:
https://youtu.be/iVFmU45w-IQ?t=9m50s
Hope you find this helpful