This is actually doing what you're last sentence suggests. It is intended as a platform and for people to publish series of cards on and it is a hosted service.

This is actually doing what you're last sentence suggests. It is intended as a platform and for people to publish series of cards on and it is a hosted service. The creation is limited to the app currently. The web site is secondary, this is primarily an app. A problem with apps and a reason why the web site even exists is that they lack discoverability when starting out. The web site offers a 'view only' view of the cards that are fully interactive on the app. The value prop here is a combination of a few things. The card format stands out in usability when viewing on mobile devices particularly on larger screens such as iPhone 6 Plus. The way a card can be manipulated and expanded makes it ideally suited for that type of device. Combining that with a way to organize cards by series makes it a straightforward way to get at sometimes highly niche information such as the example of video game characters or items.