For what it's worth, Charity Navigator gives them 4 out of 4 stars with a 98.33/100 rating: https://www.charitynavigator.org/ein/200049703
Meanwhile eg the American Cancer Society gets 73/100 and spends more on fundraising than WMF's entire budget, so oncologists can snort blow off hookers in Vegas, but nobody cares.
And here's an alternative way to browse Wikipedia and WikiData: https://conze.pt/
These sites are possible because the Wikimedia Foundation puts a lot of effort into making it easy for others to retrieve the data and reuse them.