The other examples you give are all software that people use "in the real world" as a means to solve problems. The value comes from using them. The developers m

The other examples you give are all software that people use "in the real world" as a means to solve problems. The value comes from using them. The developers may also enjoy working on them, but that's mostly incidental. I can't speak for the kolibrios contributors, but I imagine that to them, the value comes from the development process itself. They do it because they enjoy it. Any practical usefulness of the resulting software is mostly incidental. If your goal was to develop useful software in 2023, you wouldn't be writing pure x86 assembly within the constraints of a floppy disk.