There’s a mix of reasons to start a hobby project.
One reason for starting a hobby project is the learning experience. For example, learning a new programming language or a particular tech stack. The goal isn’t to build something useful. Often it can be building things that already exist. For example, a Minecraft server or a Gameboy emulator.
Another reason is to build something useful for you. Maybe you have an idea of a program you feel should exist. Or maybe a program exists, but not in the way you want. Building it yourself can bridge this gap. Hopefully someone else might find your program useful.
Then there’s also the people who do it for fun. It’s kind of like building a model railway. The process of building it can be more fun and rewarding than actually using it.
Regarding Linux, it’s mostly a matter of preference. There are some things that are easier in Linux. Mac and Windows can sometimes be ” overly protective” and prevent the user from doing particular things. Linux has generally fewer of such barriers.
Creator of curl just made a rant about users submitting AI slop vulnerability reports. It has gotten so bad they will reject any report they deem AI slop.
So there’s some data.