In 2018 and 2019, tech workers stood up, pushed back and said no, to projects and working environments they disagreed with. At Amazon, Google, Microsoft: they said no to government contracts, no to sexual harassment. Are we witnessing a revolution? A unique movement led by a new generation of data scientists with a strong conscience? We explore this question with Guillaume Chaslot, who worked on YouTube's controversial recommendation algorithm, and with computer science PhD students.