I’d imagine they’re mostly physically disabled people trying to get control of their limbs or access to the freedom this type of tech is promising. As abhorrent as all of the testing behind this tech is, if I were a quadrapalegic or something similar, I would volunteer because wtf else have I got going for me?
Because the Cyberpunk 2077 setting which is based on the original TTRPG is set in Night City which is in America.