Datamoshing or Glitch art. There's even a ffmpeg fork just for glitching: https://github.com/ramiropolla/ffglitch-core

Pretty sure the majority of people who are a part of the community work a 9-5. But yes, spending after work hours making something that's just completely out there with no monetary purpose at all is much more nourishing for the soul than attempting to create a passive income machine.