I suspect it's a passion project, or a learning project. I wrote something similar a few years ago so I could go through the process of making it into the app

I suspect it's a passion project, or a learning project. I wrote something similar a few years ago so I could go through the process of making it into the app store. I didn't expect a lot (or any) sales. (But I probably should have put it up on Hacker News so I could get all kinds of comments like yours.)