Why isn’t the browser development organized as charitable work?

From the Corp’s Wikipedia page [0]:

> As a non-profit, the Mozilla Foundation is limited in terms of the types and amounts of revenue it can have.

Is this an oblique way of saying they couldn’t take Google bucks that way?

[0] https://en.wikipedia.org/wiki/Mozilla_Corporation

Yes. https://www.irs.gov/charities-non-profits/unrelated-business...