Eric Nguyen (@exnx) saw a gap: no public AI model existed to detect dangerous pathogens. His first instinct was straightforward. Build an API, host it, and let anyone screen a sequence. Biosecurity experts told him to stop. A tool that answers yes or no is not just a screen, they explained. It is a reward signal: a way for someone building something dangerous to know, iteration by iteration, when they have gotten past it.