Some quick highlights: of their >$150M of usable donations, they spent about 57% of it on "salaries," 10% of it on "awards and grants," 4% of it just on processing donations, and a measly 2% on actual hosting costs.
[1] https://upload.wikimedia.org/wikipedia/foundation/2/26/Wikim...
Wikimedia foundation has cancer [1]. They've provided a huge value and reaped big rewards, but now they have built to grow, and the growth engine just keeps wanting to grow.
[1] https://en.m.wikipedia.org/wiki/User:Guy_Macon/Wikipedia_has....
This needs to be taken with the thought that not all projects necessarily end up good.
That's a good sign, isn't it? It means they are efficient and don't waste their budget on overpriced cloud services.
I'd be more pissed if a significant junk of the donations went straight to AWS.
For most companies the main expenditure is HR, that's normal and certainly expected for an org focused mainly on knowledge and information.
Just keep in mind, when you don't use AWS, lots of costs that would normally be hosting costs become salary costs instead (the data center doesn't set itself up)