I donated to Wikipedia once before, but never again. Their endowment has grown to a level where they should be completely self-sustained. However, spending is out of control.
https://en.m.wikipedia.org/wiki/User:Guy_Macon/Wikipedia_has_Cancer
Edit: I'm glad Wikipedia exists, but to say they are hurting for more cash is completely false. Even according to their own financial disclosures, web hosting expenses have stabilized under $4-million a year (https://en.m.wikipedia.org/wiki/Wikimedia_Foundation). As contributions continue to grow, it is spent on higher salaries for executives. The CEO made $789k in 2021, all while content is created by volunteers.
Edit, edit: a relevant chart straight from the Wikimedia Foundation Wiki page is below. Internet hosting is one of the smallest expense buckets and has been relatively flat year-over-year. Alternatively, salaries and wages are on an unsustainable upward trajectory. This chart is even a few years old and salaries have almost doubled in the last three years to over $101-million in 2023, all while hosting expenses have remained flat.