Wikipedia spends more than that only for "Donation processing expenses". Of course it is a nice contribution but, in my opinion, very small if compared to the huge value that Google is able to get for free.
https://wikimediafoundation.org/about/2018-annual-report/fin...
I was going to be even more cynical and say that 3 million sounds absolutely pathetic relative to the scale of both entities, and given how important it is to the quality of Google’s search results.
To add to my own comment, this [1] was the submission that I originally had in mind. It was in the 2007-2008 operating year that Wikipedia's expenses crossed the $3 million threshold. In 2015-2016 the expenses were >$65 million. In 2019, they were $91 million. Remember that the content creators work for free.
The reports are available here [2]. Looking at the most recent report here for FY18-19, the amount spent on hosting is $2.3 million. That's less than half of the "donation processing expenses"!