At 4DV.ai, we are working on 4D video creation, playing and editing tools based on Gaussian Splatting. We envision 4D video to be the future of visual media and ultimate medium for immersive storytelling.

This talk tells the story of how I tried to solve a problem - and in doing so, understood how push notifications actually work. Why my first approach didn’t scale. Why almost every app uses Firebase or APNs. Why even Signal knocks at Google’s door. And why, since the Wyden letter of 2023, this is a documented privacy problem: “We kill people based on metadata.”