What’s in a name? Legally speaking, your brain and nervous system would be classified as an ‘unintentional radiator’ (MRIs work because of this fact) and as such would fall under regulated devices if we weren’t legal persons.

I used ‘unregulated’ (errantly if you insist) to mean both unlicensed and also use cases where FCC isn’t actively enforcing the regulations on the books, cause technically virtually everything is ‘regulated’.