Not every project needs to seek to make money. Sometimes you want to put something out there for the sake of putting something out there without worrying that you are going to need to pay up for it.
While we are at it, I want to shill my personal favorite engine...Godot. I know its fairly well known in the HN scene, but I think that this should be a push to use more free and open-source technology in game dev, rather than relying on a bunch of corporate black boxes that can turn predatory at any minute.