https://www.technologyreview.com/s/604037/meet-the-guys-who-sold-neuralink-to-elon-musk-without-even-realizing-it/amp/
Pedram Mohseni original owner of Neuralink name. Mainly, used to treat disease, probably using AI connection to create a buzz for new venture.
In addition to Musk, the online payments entrepreneur Bryan Johnson is putting $100 million in a company called Kernel, which is also developing brain implants.