Ask HN: Why are developers so obsessed with starting their own business?

An observation I have made for quite some time is that 90%, or maybe even 95% of the developers I know are always obsessed with working on their own side-projects with the hope of one day turning it into a full-blown start-up, or at least making some passive income from it. Many of my non-developer friends, never even think about this. Some of them are thinking about new ideas to implement in their job, but never with the same obsession that developers seem to talk about it. (I am a developer as well, also obsessed with the idea of turning one of my side projects into a comfortable passive stream of income or maybe a startup one day)