The bylaws do not say anything about what might motivate contributors to contribute, nor their level of commitment to GNOME, when it defines a "contributor" in terms of foundation membership but it does fairly clearly describe about what a "contributor" is. The main thing that is unclear in the bylaws is what defines a "non-trivial contribution" really and this becomes even more confusing because the practice is to state that all interns who make contribution from 40 hour weeks over a period of 3 months are not eligible until they contribute more stuff.