What I enjoy the most is when I finish a course and I publish the materials in the repository of my university with CC-BY license . Many of the materials by my colleagues are closed. The university warns students cannot share them to avoid copyright issues. Regarding my materials, I believe in the future any professor will be able to start from that point, without having to do everything from 0, etc. That means benefits for the students. So, it's good to publish them openly.😄