These are only some of the salaries of a small fraction of the employees for which the salary number is even avaiable. WMF employs 5 or 6 times as many people, and it’s not clear to me what half of them are even doing. I was an admin on Wikipedia in 2007-2010, when WMF was tenth of its current size, and the Wikipedia community never felt the lack of manpower on the foundation side. Now they are an order of magnitude bigger, but in terms of end to end impact it hardly changed at all.

Those salaries seem low, are they not based in SF?

Interesting. Does this page show that they have had a CTO for just 3 of the past 10 years? Or only that they paid a CTO for those years?