And yet... we wouldn't have the wonderful ecosystems of GNU, BSDs, etc. if not for people who love their unpaid work and feel they owe the world something, even if they really, truly don't.
Most of the open source devs from that generation did this as a hobby - many of us had to write dreary business software at our day jobs and loved UNIX, so creating these tools was just fun. If it ever felt like a burden, you'd just step back and let someone else fill in or not and not worry about it.
