I think your premise is wrong. The page you linked to alone mentions half a million in revenue & grants.

The Wikipedia page links to a Guidestar report that notes 2.9M in revenue in 2015.

Python is valuable, but how valuable is the iterative development on the actual core? There are still a lot of companies on 2.7 who have basically decided that the last decade of Python work isn't really useful enough to even do a free upgrade and are only starting to migrate now that all the libraries are ending support.