It has been raising an endowment for several years: https://meta.wikimedia.org/wiki/Wikimedia_Endowment
You can donate at https://donate.wikimedia.org/w/index.php?title=Special:Landi...
You can donate at https://donate.wikimedia.org/w/index.php?title=Special:Landi...
If the endowment is just one more account that can be drained at will we have no protection from a sudden drop in revenue while the WMF maintains the current spending levels in the hope that revenue will recover.
I also looked into whether the endowment is legally protected against a large payout as a result of a lawsuit. I am not a lawyer, but it looks like the WMF needs to structure the endowment so that the WMF cannot legally dip into the principal to get that sort of protection.
Full disclosure: I am the author of the Wikipedia essay "Wikipedia has cancer".