The author linked the report:
https://projects.propublica.org/nonprofits/organizations/200...I know it's from 2018 and maybe something changed, but: they took $115M. They paid $90M in costs, including $38M in salaries and Imagine you just hire a techy support staff. Let's assume you only need 50 people, each making $100k to operate a global website in all timezones. That's probably like $140k total costs per employee (healthcare, benefits, payroll, all sorts of taxes). You need 50*140k=$7M/yr. Assume you buy AT&T stock with 6% dividend. You need $120M of assets to get $7M. There is no safety here, and also my calculation doesn't include maybe like 5% increase in costs per year.
I often wonder how could I create a fully self-sustainable non-profit: the one, that doesn't require begging for money and wasting time every year. Instead, the one that could operate independently. To make this happen, you pretty much have to invest the money very, very well, and diversify to the point where the yield is low, yet high enough to hire staff etc. (an example of sustainable donation is present in the Thorp's "A man of all markets" wrt. his endowment to UCI math department) For this you must have a pile of money, if you do the math, and it'd make perfect sense for Wikipedia.
Unless they shrink, lay people off and optimize, they'll need $2B to be fully self-sufficient and sustainable. Otherwise, the fundraiser will need to bring $100M/yr at least.