[Matumio]

For the joy of building your own thing?

People also keep knitting clothes despite how cheap they are to buy. They solve math problems that have been solved before, to get better at math, instead of starting with an unsolved problem. They write about things they are enthusiastic about, maybe to remember the experience, maybe to get better at writing, or to dip their toes into publishing.

Some people also seem to like reading such articles, given the upvotes. I guess it's about sharing the experience of something that interests you. Learn how it might turn out.