Why does everything need to serve a purpose? I can believe the author wrote this just "Because I Can", which is a perfectly good reason to me. Most stuff I work

Why does everything need to serve a purpose? I can believe the author wrote this just "Because I Can", which is a perfectly good reason to me. Most stuff I work on in my free time, I do just for me. If I think anybody else might be interested in it, not necessarily because it's useful but just because it's interesting, then I share it. Edit to add: Not suggesting that you think it needs to serve a purpose, this just felt like the most appropriate thread to add my comment to.