Forks of Chromium are not controlled by Google. Google gave up the legal right to restrict what other parties can do with Chromium when they released it under a liberal open-source license. Google has a little influence over Chromium in that the people that designed and implemented Chromium mostly still work for Google.

Google has more control over Mozilla than they do over organizations that have forked Chromium because about 90% of Mozilla's revenue comes from Google.