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.
There are many people with axes to grind with wikipedia - disagreements with the way certain topics are represented, and the way wikipedia has become a huge resource for information and news is not good news for everyone.
I spend way more money on entertainment being piped into my TV, or deliveries happening a day quicker than I do on a website I use several times a day.