Note that "Direct support to websites" includes things like designing and implementing more intuitive article editing UI, which while potentially worth it isn't the kind of "obviously we must do this" that keeping the site serving is.
For example, in 2016 Wikipedia served a similar amount of page views as it does today [1] on an operating budget of about half [2]. Go farther back and my impression is it's much more dramatic, though I'm not finding good page view statistics for, say, 2010.
[1] https://stats.wikimedia.org/#/all-projects/reading/total-pag...
[2] https://foundation.wikimedia.org/wiki/File:Wikimedia_Foundat... vs https://foundation.wikimedia.org/wiki/File:Wikimedia_Foundat...