“Google’s intention, as expressed in the developer documentation, was that Chromium would be the name of the open source project and that the final product name would be Chrome; however other developers have taken the Chromium code and released versions under the Chromium name.”
https://en.wikipedia.org/wiki/Chromium_%28web_browser%29
Who do you think funds Chromium?
Whoever feels like doing so. Anyone qualified may contribute development time to Chromium. It is not under Google's control. You can fork off source at any time and customize it. Chromium is to Chrome as Pale Moon is to Firefox.