Long term support
The biggest question any patient in these trials should have is: What happens after 72 months (or even sooner) if Neuralink either no longer exists or moves on to newer prototypes. How long will they actually support the devices they implant? Or will participants end up with a dead, unsupported device in their body that the manufacturer no longer wants to support or where the manufacturer and records on what exactly is implanted and how to remove it are no longer available?
I have a hard time trusting a company operating in the medical field that seems to hold a "move fast and break things" approach to medical device creation.