Sometimes also the project is just 'done'. I many years ago made a windows screensaver (never released to anyone else). Just so I could have a '2001' screen saver. Basically in the background of the movie was all these screens flashing just weird status stuff. It was a cool aesthetic I kinda liked. Spent many weeks getting it to flash 'just right' and have the right animations for the right feel. Then LCD screens basically killed any need to have a screen saver. As basically instant on/off meant there was no reason to have the monitor running all the time. So the project was done.