This article talks about the origin and adoption of Lottie, the tool from Airbnb that lets you create your app's animations and transitions in After Effects:

Quickly, developers have learned that thanks to these gesture playback controls, they can actually use Lottie to simulate something as complicated as a social media feed. Pulling down is play. Pulling up is rewind. And the end user is no wiser that they’re essentially just scrubbing back and forth through a very clever YouTube clip.