So there are a number of Brain-Computer Interfaces with different degrees of invasiveness. The technology exists already to move a mouse with non invasive BIC devices. When you consider both the complications of invasive surgery and implantation of medical devices from startups, which may not exist to provide long term support for their technology. Combined with the long history of Elon Musk and his companies taking short cuts and failing to do due diligence before bringing a product to market. Makes this seem reckless at best.
I have nothing against advancing technology, but we can do all of this without endangering people. In this case people who are more vulnerable because of disability. I am not against or dismissive of BIC technology. I am very concerned about Elon Musk and how he will cut corners. He could set back research and cause much more harm then good.
Here is an article about how using start up culture in the bio medical world can effect the disabled when there tech is no longer supported.