That might have been the case 10 years ago but not today. According to G. Kroah-Hartmann, more than 80% of kernel contributors are full-time paid developers, th

That might have been the case 10 years ago but not today. According to G. Kroah-Hartmann, more than 80% of kernel contributors are full-time paid developers, the remaining 20% being spread among free-time contributors and companies who do not want to disclose their names. People contributing to gcc, mozilla or OpenOffice are all full-time paid developers funded by a company to do so.