By "turn it off" I mostly mean that Kagi have their own AI driven tools available, but a toggle in your user settings disables it completely.

ie it's not forced down your throat, nor mysteriously/accidentally/etc turned back on occasionally

It's driven by community ratings.

https://news.ycombinator.com/item?id=45919067

so it is like humans vs robots started? robots ask humans questions to verify they are not robots. humans mark content as robot-generated to filter it out.

My first instinct is that users abuse it like they do any other report/downvote mechanism. They see something they just don't plain like, they report it as AI slop.