Yes. There were no decisions on linking it only from /contribute/. I put it there because when I quickly made the /donate/ page, /contribute/ was the most obvious place to link it from.
If you see other spots where it could make sense to place such link, feel free to add it :)
I'm not sure the first two (link /who/ in the footer, and /who/ link /contribute/) makes much sense, since they are both in the navigation bar on top. That said, linking /donate/ in /who/ might make sense.
Also, "not-for-profit", and the 501(c)3 thing are useful only in /donate/, I wouldn't mention it anywhere else. And I hoped the "cross-distro" and "open source" part would be clear enough by the content in /who/? Otherwise that should really be improved…
I'm going to make the very very bold step of closing this issue. Immediately re-open (without prejudice!) if I missed anything or you have specific/concrete ideas on how to improve the status quo. :)