[yscik]

Having a computer and radio in your brain doesn't mean you have to expose access to anything via the radio link. Even if you want to, there has to be software in between the connection to the meat and any APIs you provide for controlling your body, mapping intentions to raw signals for the neurons. This would have some form of access-control and safety features.

[Teever]

How will you know if the safety features have not been compromised?

[bpizzi]

By building it yourself.

[ceejayoz]

Which'll be impossible. A single human isn't even capable of the supply chain for your average dumb toaster, let alone a neural implant.