Wow, you're taking in an Orwellian direction. The reason my extension doesn't qualify as a gatekeeper under your definition is that its use is distributed, not centralized. Each individual user gets to set the tolerance threshold according to their use case. It has no power to "act autonomously."

It also can't be used as a gatekeeper in that sense precisely because of its inherent fallibility. It will definitely miss some gen-AI writing and return false positives on real human writing. It's only supposed to be "much better than nothing" for people who reject the inhuman homogeneity of AI-writing and want to see less of it on their screen.

I'm not sure I follow your trickle-down argument, but in any case, the system is dynamic. It checks daily for new models and human-authored articles on their specific ticks, and cross-checks a corpus of known human-authored works. It will track both AI and human writing over time and adjust accordingly.