[earbitscom]

Take into consideration that most APIs don't contain primarily data and information about trademarked characters and copyrighted works. They are going to err on the side of being very cautious when opening up an API full of their popular intellectual property.

[sbarre]

This is a very good point. The Marvel universe is a "premium" brand, in it's own way.

I wouldn't be surprised if opening up this API was a non-unanimous decision with lots of internal dissent.

[Nullabillity]

Looking at their docs it seems like it's just IMDB-style metadata for a single publisher.