You can read more in their financial filings, which is part of what this thread is about:
>"The Foundation has an agreement with the Tides Foundation that established the Wikimedia Endowment
as a Collective Action Fund to act as a permanent safekeeping fund to generate income to ensure a base
level of support for the Wikimedia projects in perpetuity. The Endowment is independent from the
Foundation. From fiscal years ended June 30, 2016 through June 30, 2021, the Foundation provided
irrevocable grants in the total amount of $30 million ($5 million per fiscal year) to the Tides Foundation for
the purpose of the Wikimedia Endowment."
Money from donors, given to Tides, disbursed into the ether.
>"The Foundation has an agreement with the Tides Foundation that established the Wikimedia Endowment as a Collective Action Fund to act as a permanent safekeeping fund to generate income to ensure a base level of support for the Wikimedia projects in perpetuity. The Endowment is independent from the Foundation. From fiscal years ended June 30, 2016 through June 30, 2021, the Foundation provided irrevocable grants in the total amount of $30 million ($5 million per fiscal year) to the Tides Foundation for the purpose of the Wikimedia Endowment."
Money from donors, given to Tides, disbursed into the ether.