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Why is everything a "product"? Why does everything have to be marketed? Why does there have to be a need for something, for it to be built and to be noteworthy?

This looks like a cool personal project, built by the author as a learning experience, with a convenient API to manipulate the machine that's being simulated. If that doesn't tell you enough about why it exists, then I don't know what to tell you besides "nothing to see here".

>customer

You see, that's where you're way off base. Not everything shown here is going to be a 'product'; people often like to learn by doing, and showing what they create.

Most of this kind of stuff is done for intellectual gratification. It's playing; the tools are just more sophisticated, and it takes more brainpower than usual.