Most closed-sourced devs, either. Both groups mostly toil away in obscurity, at normal dev day-jobs, or as university students on scholarships and grants.

You only get famous, if you build something really groundbreaking, whether it's closed-sourced or open-sourced.

And a lot of (most?) open-source code actually comes from those day jobs, so our employers cross-finance the work on OS with our other stuff.