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I assume it's intended to be used in an educational context. Learning how to work with a simple API is more fun that way.

The last category on the left sidebar is "FHGR", which I'm guessing stands for Fachhochschule Graubünden, and indeed under IM2 we find:

> APIs handpicked by the University of Applied Sciences of Grisons for their IM2 JavaScript programming course...

That explains why there’s so many Swiss APIs.