“But keeping Wikipedia online is a task that the WMF could comfortably manage on $10 million a year, according to a casual 2013 estimate by Erik Möller, its VP of engineering and product development at the time.”
The banners make it sound like Wikipedia is one bad month from going dark. The foundation hit its $100 million endowment goal five years early and sits on about $300 million. In 2007 it ran on 11 employees and $2 million. The volunteers who write the thing still work for free.