https://upload.wikimedia.org/wikipedia/foundation/1/1e/Wikim...
https://meta.wikimedia.org/wiki/Fundraising/2020-21_Report
Moreover, it's not a question of "keeping Wikipedia running" – the Wikimedia Foundation is taking more than enough money for that. Revenue has increased every year of the Wikimedia Foundation's existence, and it had (including endowment growth) a total surplus of nearly $90 million in its 2020/21 financial year, as well as hundreds of millions in reserves:
https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Signpost/2...
https://en.wikipedia.org/wiki/Wikimedia_Foundation#Financial...
In fact, the success of Wikipedia fundraising is such that by now, many Wikipedia volunteers feel that fundraising emails asking people to donate money "to keep Wikipedia online", "ad-free", or "independent", are grossly misleading and unethical:
https://en.wikipedia.org/wiki/Wikipedia:Village_pump_%28prop...
https://news.ycombinator.com/item?id=32713978
(P.S. This is the second item today that is a straight copy of an earlier submission – see https://news.ycombinator.com/item?id=32793755 – What is going on?)