Why is Elon Musk investing in Neuralink at all? Shouldn't he build electric cars or fly to Mars?
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Neuralink is Elon Musk's side project, and he is investing in it for the same reason as he is investing in anything else. Whether it be income or he just simply is interested in the idea of brain implants and would like to see them through.

Elon musk is keen on implementing a lot of different technologies, among the beforementioned electric cars, space travel and Neuralink. He as a person seems to be interested in them and using his wealth to achieve a sort of "fantasy" of achieving these technologies which used to be simply science fiction before. He seems to be a person led by interest and curiosity, which is shown by his naming of his products and companies. He needed a construction company for digging the tunnels for the Tesla's underground network, and he named that companty "the boring company" showing how he only started that company out of need, and not because he like's it.
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