my interpretation: MAU are going down rapidly and they need a KPI to counter that
Also anecdotally: despite the embarrassing scam of "AI detectors," many kids did not actually get away with cheating via ChatGPT last year. Issues like fictional citations, "as a large language model I cannot," and making up facts affect high school English papers just like legal filings or scientific articles about rats. And unlike scientific peer review, high school teachers usually read things closely and notice when something isn't right. You don't need an AI detector to be suspicious when an impeccably well-written essay discusses events in Great Expectations that didn't happen.