I think there are two points here:

The first point is more-or-less: the OP should be using their talents for something "better". I don't think this is a really interesting question.

Them more interesting point is: "is this project useful?"

The end product likely won't directly serve some "useful" purpose, like making money or even being played by others.

On the other hand, building such a thing is _likely_ going to teach the poster a large number of useful skills that will serve them for "useful" projects.