Geoff Weiss / Business Insider: Superhuman acquires AI detection startup GPTZero, which has 19M+ registered users and $30M in annual recurring revenue; PitchBook: GPTZero is valued at $88M+ — As AI-generated content storms the internet, productivity company Superhuman is acquiring GPTZero, an AI detection startup cofounded by Edward Tian and Alex Cui in 2023.